上海朔川電氣設(shè)備有限公司

免費會員

您現(xiàn)在的位置：上海朔川電氣設(shè)備有限公司>>智能控制PLC模塊>>西門子工業(yè)電器電源6EP>> 西門子6ES71415AF000BA0

西門子6ES71415AF000BA0

參考價:	面議

參考價:

面議

具體成交價以合同協(xié)議為準

產(chǎn)品型號
品牌
經(jīng)銷商 廠商性質(zhì)
上海市 所在地

訪問次數(shù)：341更新時間：2017-11-07 16:29:12

在線詢價加入對比查看聯(lián)系方式

聯(lián)系我們時請說明是智能制造網(wǎng)上看到的信息，謝謝!

分享

智能控制PLC模塊

上海朔川電氣設(shè)備有限公司

免費會員·9年

聯(lián)系人：: 吉夢琪

在線咨詢給我留言

掃一掃訪問手機商鋪

產(chǎn)品簡介

西門子6ES71415AF000BA0

產(chǎn)品介紹

西門子6ES71415AF000BA0 西門子6ES71415AF000BA0

6ES7141-5AF00-0BA0

SIMATIC ET 200, DI 8x 24VDC,4x M12, 防護方式 IP67

公司名稱：上海朔川電氣設(shè)備有限公司

聯(lián) 系人：吉夢琪

：

地址：上海市金山區(qū)涇波路129號

信譽*，客戶*是公司成立之初所確立的宗旨，在公司的嚴格要求和員工們不折不扣地貫徹執(zhí)行下發(fā)展延續(xù)至今。“假一罰十”一直是我公司的主動承諾。
承諾一：1、保證全新*

承諾二：2、保證安全準時發(fā)貨
承諾三：3、保證售后服務(wù)質(zhì)量
流程一：1、客戶確認所需采購產(chǎn)品型號
流程二：2、我方會根據(jù)詢價單型號查詢價格以及交貨期，擬一份詳細正規(guī)報價單
流程三：3，客戶收到報價單并確認型號無誤后訂購產(chǎn)品
流程四：4、報價單負責人根據(jù)客戶提供型號以及數(shù)量擬份銷售合同
流程五：5、客戶收到合同查閱同意后蓋章回傳并按照合同銷售額匯款到公司開戶行
流程六：6、我公司財務(wù)查到款后，業(yè)務(wù)員安排發(fā)貨并通知客戶跟蹤運單

您隨口的一問多少錢，我就立馬放下筷子趕緊回話。

您隨口的一句有沒有現(xiàn)貨，我就立馬進去系統(tǒng)拼命地找。

您隨口問了問能優(yōu)惠不？我就到處想辦法。

您很隨便，我卻很當真；您不知道我的回答，只為得到您的滿意..……

只因為我和您不止是客戶的關(guān)系，而是把您當我的朋友，在全力以赴做到我能做到的

您的選擇您的支持是我zui大的動力！ ————致我親愛的客戶（好朋友）

產(chǎn)品簡述：質(zhì)保一年，一年內(nèi)因產(chǎn)品質(zhì)量問題免費更新產(chǎn)品不收取任何費用

哪里有賣要多少錢哪里有哪里能買到要在哪里買在哪里有賣的價格，參數(shù)，型號，哪家便宜，比較便宜，哪里有，銷售，訂貨號，多少錢？哪家價格好？廠家，性能，優(yōu)點，包裝，用途，售后服務(wù)!哪里有賣代理商總代理商

數(shù)字量輸入輸出模塊

訂貨數(shù)據(jù)
附件
產(chǎn)品信息
組態(tài)工具

跳轉(zhuǎn)到

概述

應用

設(shè)計

功能

技術(shù)規(guī)范

更多信息

概述

30 mm 和 45 mm 寬的模塊具有參數(shù)設(shè)置和診斷功能
帶有 M8 或 M12 接口的 8 通道數(shù)字量輸入模塊
帶有 M12 接口的 16 通道數(shù)字量輸入模塊
帶有 M8 或 M12 接口的 8 通道數(shù)字量輸入輸出模塊
帶有 M12 接口的 8 通道數(shù)字量輸出模塊 2A

應用

數(shù)字量輸入可記錄設(shè)備中的 24 V DC 信號，并將信號傳送到控制器?？梢赃B接開關(guān)以及 2 線制、3 線制或 4 線制接近開關(guān)。

數(shù)字量輸出可以切換設(shè)備中的 24 V DC 電壓，從而可將內(nèi)部信號從控制器傳輸至設(shè)備。可以連接電磁閥、直流接觸器和指示燈。

30 mm 寬的 I/O 模塊尤其適合在狹小空間內(nèi)使用，由于可設(shè)定參數(shù)并具有診斷功能，從而可根據(jù)相應過程要求進行靈活調(diào)整。

可提供以下數(shù)字量 I/O 模塊：

數(shù)字量輸入模塊 DI 8X24VDC, 8XM8
數(shù)字量輸入模塊 DI 8X24VDC, 4XM12
數(shù)字量輸入模塊 DI 16X24VDC, 8XM12
數(shù)字量輸出模塊 DQ 8X24VDC/2A, 8XM12
數(shù)字量 I/O 模塊 DIQ 4+DQ 4X24VDC/0.5A，8XM8
數(shù)字量 I/O 模塊 DIQ 4+DQ 4X24VDC/0.5A，4XM12

設(shè)計

在所有安裝位置均可在前面或側(cè)面進行螺絲固定，因此 I/O 的安裝方式多種多樣，可使用滑塊安裝在平坦表面和鋁制導軌上。

這些數(shù)字量 I/O 模塊具有以下功能：

背板總線接口（ET 接口）采用 M8 連接技術(shù)，用于連接到接口模塊或其它 I/O 模塊
采用 M8 連接技術(shù)的電源接口，具有轉(zhuǎn)發(fā)功能
通過 LED 燈顯示通道狀態(tài)
通過 LED 燈顯示模塊狀態(tài) (DIAG)
負載電壓 2L+ (PWR) LED 指示燈（*于帶輸出的模塊）
用標簽來標識通道、模塊和插槽
集成式電纜扣開孔
模塊正面的清晰標簽：
- 用純文本表示模塊類型
- 通道編號標簽
- 接口標識
模塊側(cè)面的清晰標簽：
- 訂貨號、功能狀態(tài)和固件版本
- 二維矩陣碼（訂貨號和序列號）
- 所有接口的針腳分配

這些模塊提供有標簽，用于標識通道、模塊和插槽。這些標簽可用市售貼標簽系統(tǒng)以機械方式印字。

功能

統(tǒng)一的顯示和診斷方式：
- 邏輯“0”和邏輯“1”信號狀態(tài)的通道狀態(tài)指示燈（綠色 LED）
- 模塊狀態(tài)顯示（DIAG，紅色/綠色 LED 燈）
- 用于監(jiān)控負載電壓 2L+ 的指示燈（PWR，綠色 LED 燈，*于帶輸出的模塊）
支持的功能：
- 與通道相關(guān)的參數(shù)分配
- 精細到模塊的診斷和診斷中斷
- 識別和維護數(shù)據(jù) IM0 ...IM3
- 固件更新
- PROFIenergy

技術(shù)規(guī)范

Article number	6ES7141-5BF00-0BA0	6ES7141-5AF00-0BA0	6ES7141-5AH00-0BA0
	ET 200AL, DI 8X24VDC, 8XM8	ET 200AL, DI 8X24VDC, 4XM12	ET 200AL, DI 16X24VDC, 8XM12
General information
HW functional status	E01	E01	E01
Firmware version	V1.0.x	V1.0.x	V1.0.x
Product function
● I&M data	Yes; I&M0 to I&M3	Yes; I&M0 to I&M3	Yes; I&M0 to I&M3
Engineering with
● STEP 7 TIA Portal configurable/integrated as of version	STEP 7 V13 SP1 or higher	STEP 7 V13 SP1 or higher	STEP 7 V13 SP1 or higher
● STEP 7 configurable/integrated as of version	From V5.5 SP4 Hotfix 3	V5.5 SP4 Hotfix 7 or higher	V5.5 SP4 Hotfix 7 or higher
● PROFIBUS as of GSD version/GSD revision	GSD as of Revision 5	GSD as of Revision 5	GSD as of Revision 5
● PROFINET as of GSD version/GSD revision	GSDML V2.3.1	GSDML V2.3.1	GSDML V2.3.1
Supply voltage
Load voltage 1L+
● Rated value (DC)	24 V	24 V	24 V
● permissible range, lower limit (DC)	20.4 V	20.4 V	20.4 V
● permissible range, upper limit (DC)	28.8 V	28.8 V	28.8 V
● Reverse polarity protection	Yes; Against destruction; encoder power supply outputs applied with reversed polarity	Yes; Against destruction; encoder power supply outputs applied with reversed polarity	Yes; Against destruction; encoder power supply outputs applied with reversed polarity
Input current
Current consumption (rated value)	25 mA; without load	25 mA; without load	30 mA; without load
from load voltage 1L+ (unswitched voltage)	4 A; Maximum value	4 A; Maximum value	4 A; Maximum value
from load voltage 2L+, max.	4 A; Maximum value	4 A; Maximum value	4 A; Maximum value
Encoder supply
Number of outputs	8	4	8
24 V encoder supply
● Short-circuit protection	Yes; per module, electronic	Yes; per module, electronic	Yes; per module, electronic
● Output current, max.	0.7 A; Total current of all encoders	0.7 A; Total current of all encoders	1.4 A; Total current of all encoders
Power loss
Power loss, typ.	1.9 W	1.9 W	2.7 W
Digital inputs
Number of digital inputs	8	8	16
Input characteristic curve in accordance with IEC 61131, type 3	Yes	Yes	Yes
Number of simultaneously controllable inputs
all mounting positions
— up to 55 °C, max.	8	8	16
Input voltage
● Type of input voltage	DC	DC	DC
● Rated value (DC)	24 V	24 V	24 V
● for signal "0"	-30 to +5V	-30 to +5V	-30 to +5V
● for signal "1"	+11 to +30V	+11 to +30V	+11 to +30V
Input current
● for signal "1", typ.	3.2 mA	3.2 mA	3.2 mA
Input delay (for rated value of input voltage)
for standard inputs
— at "0" to "1", min.	1.2 ms	1.2 ms	1.2 ms
— at "0" to "1", max.	4.8 ms	4.8 ms	4.8 ms
— at "1" to "0", min.	1.2 ms	1.2 ms	1.2 ms
— at "1" to "0", max.	4.8 ms	4.8 ms	4.8 ms
Cable length
● unshielded, max.	30 m	30 m	30 m
Encoder
Connectable encoders
● 2-wire sensor	Yes	Yes	Yes
— permissible quiescent current (2-wire sensor), max.	1.5 mA	1.5 mA	1.5 mA
Interrupts/diagnostics/status information
Alarms
● Diagnostic alarm	Yes; Parameterizable	Yes; Parameterizable	Yes; Parameterizable
Diagnostic messages
● Short-circuit	Yes; Sensor supply to M; module by module	Yes; Sensor supply to M; module by module	Yes; Sensor supply to M; module by module
Diagnostics indication LED
● Channel status display	Yes; Green LED	Yes; Green LED	Yes; Green LED
● for module diagnostics	Yes; Green/red LED	Yes; Green/red LED	Yes; Green/red LED
Potential separation
between the load voltages	Yes	Yes	Yes
Potential separation channels
● between the channels	No	No	No
● between the channels and backplane bus	Yes	Yes	Yes
● between the channels and the power supply of the electronics	No	No	No
Isolation
Isolation tested with	707 V DC (type test)	707 V DC (type test)	707 V DC (type test)
Degree and class of protection
Degree of protection acc. to EN 60529
● IP65	Yes	Yes	Yes
● IP67	Yes	Yes	Yes
Ambient conditions
Ambient temperature during operation
● min.	-25 °C	-25 °C	-25 °C
● max.	55 °C	55 °C	55 °C
Connection method
Design of electrical connection for the inputs and outputs	M8, 3-pole	M12, 5-pole	M12, 5-pole
Power supply	M8, 4-pole	M8, 4-pole	M8, 4-pole
ET-Connection
● ET-Connection	M8, 4-pin, shielded	M8, 4-pin, shielded	M8, 4-pin, shielded
Dimensions
Width	30 mm	30 mm	45 mm
Height	159 mm	159 mm	159 mm
Depth	40 mm	40 mm	40 mm
Weights
Weight, approx.	145 g	145 g	184 g

Article number		6ES7142-5AF00-0BA0
		ET 200AL, DQ 8X24VDC/2A, 8XM12
General information
HW functional status		E01
Firmware version		V1.0.x
Product function
● I&M data		Yes; I&M0 to I&M3
Engineering with
● STEP 7 TIA Portal configurable/integrated as of version		STEP 7 V13 SP1 or higher
● STEP 7 configurable/integrated as of version		V5.5 SP4 Hotfix 7 or higher
● PROFIBUS as of GSD version/GSD revision		GSD as of Revision 5
● PROFINET as of GSD version/GSD revision		GSDML V2.3.1
Supply voltage
Load voltage 1L+
● Rated value (DC)		24 V
● permissible range, lower limit (DC)		20.4 V
● permissible range, upper limit (DC)		28.8 V
● Reverse polarity protection		Yes; against destruction; load increasing
Load voltage 2L+
● Rated value (DC)		24 V
● permissible range, lower limit (DC)		20.4 V
● permissible range, upper limit (DC)		28.8 V
● Reverse polarity protection		Yes; against destruction; load increasing
Input current
Current consumption (rated value)		40 mA; without load
from load voltage 1L+ (unswitched voltage)		4 A; Maximum value
from load voltage 2L+, max.		4 A; Maximum value
Power loss
Power loss, typ.		4 W
Digital outputs
Number of digital outputs		8
● in groups of		4; 2 load groups for 4 outputs each
Short-circuit protection		Yes; per channel, electronic
● Response threshold, typ.		2.8 A
Limitation of inductive shutdown voltage to		2L+ (-47 V)
Switching capacity of the outputs
● on lamp load, max.		10 W
Load resistance range
● lower limit		12 ?
● upper limit		4 k?
Output voltage
● for signal "1", min.		L+ (-0.8 V)
Output current
● for signal "1" rated value		2 A
● for signal "1" permissible range, max.		2 A; with inductive load to IEC 60947-5-1, DC-13 / AC-15
● for signal "0" residual current, max.		0.5 mA
Switching frequency
● with resistive load, max.		100 Hz
● with inductive load, max.		0.1 Hz; 0.25 Hz at 25 °C
● on lamp load, max.		1 Hz
Total current of the outputs
● Current per group, max.		4 A; For inductive load max. 2 channels per group
Cable length
● unshielded, max.		30 m
Interrupts/diagnostics/status information
Substitute values connectable		Yes; channel by channel, parameterizable
Alarms
● Diagnostic alarm		Yes; Parameterizable
Diagnostic messages
● Short-circuit		Yes; Outputs to ground; module by module
Diagnostics indication LED
● Channel status display		Yes; Green LED
● for module diagnostics		Yes; Green/red LED
● For load voltage monitoring		Yes; Green LED
Potential separation
between the load voltages		Yes
Potential separation channels
● between the channels, in groups of		4
● between the channels and backplane bus		Yes
● between the channels and the power supply of the electronics		No; 4 channels are non-isolated and 4 channels are isolated from supply voltage 1L+
Isolation
Isolation tested with		707 V DC (type test)
Degree and class of protection
Degree of protection acc. to EN 60529
● IP65		Yes
● IP67		Yes
Standards, approvals, certificates
Suitable for safety-oriented group deactivation		Yes
Highest safety class achievable in safety mode
● Performance level according to ISO 13849-1		PL d
● SIL acc. to IEC 61508		SIL 2
Ambient conditions
Ambient temperature during operation
● min.		-25 °C
● max.		55 °C
Connection method
Design of electrical connection for the inputs and outputs		M12, 5-pole
Power supply		M8, 4-pole
ET-Connection
● ET-Connection		M8, 4-pin, shielded
Dimensions
Width		45 mm
Height		159 mm
Depth		40 mm
Weights
Weight, approx.		192 g

Article number	6ES7143-5BF00-0BA0	6ES7143-5AF00-0BA0	6ES7143-5AH00-0BA0
	ET 200AL, DIQ 4+DQ 4X24VDC/0,5A, 8XM8	ET 200AL, DIQ 4+DQ 4X24VDC/0,5A, 4XM12	ET 200AL, DIQ 16x24VDC/0,5A, 8xM12
General information
HW functional status	E01	E01	E01
Firmware version	V1.0.x	V1.0.x	V1.1.x
Product function
● I&M data	Yes; I&M0 to I&M3	Yes; I&M0 to I&M3	Yes; I&M0 to I&M3
Engineering with
● STEP 7 TIA Portal configurable/integrated as of version	STEP 7 V13 SP1 or higher	STEP 7 V13 SP1 or higher	STEP 7 V14 or higher
● STEP 7 configurable/integrated as of version	From V5.5 SP4 Hotfix 3	V5.5 SP4 Hotfix 7 or higher	V5.5 SP4 Hotfix 7 or higher
● PROFIBUS as of GSD version/GSD revision	GSD as of Revision 5	GSD as of Revision 5	GSD as of Revision 5
● PROFINET as of GSD version/GSD revision	GSDML V2.3.1	GSDML V2.3.1	GSDML V2.3.1
Operating mode
● DI			Yes
● Counter			Yes
● DQ			Yes
Supply voltage
Load voltage 1L+
● Rated value (DC)	24 V	24 V	24 V
● permissible range, lower limit (DC)	20.4 V	20.4 V	20.4 V
● permissible range, upper limit (DC)	28.8 V	28.8 V	28.8 V
● Reverse polarity protection	Yes; Against destruction; encoder power supply outputs applied with reversed polarity, loads pick up	Yes; Against destruction; encoder power supply outputs applied with reversed polarity, loads pick up	Yes; Against destruction; encoder power supply outputs applied with reversed polarity, loads pick up
Load voltage 2L+
● Rated value (DC)	24 V	24 V	24 V
● permissible range, lower limit (DC)	20.4 V	20.4 V	20.4 V
● permissible range, upper limit (DC)	28.8 V	28.8 V	28.8 V
● Reverse polarity protection	Yes; against destruction; load increasing	Yes; against destruction; load increasing	Yes; Against destruction; encoder power supply outputs applied with reversed polarity, loads pick up
Input current
Current consumption (rated value)	40 mA; without load	40 mA; without load	75 mA; without load
from load voltage 1L+ (unswitched voltage)	4 A; Maximum value	4 A; Maximum value	4 A; Maximum value
from load voltage 2L+, max.	4 A; Maximum value	4 A; Maximum value	4 A; Maximum value
Encoder supply
Number of outputs	4	4	8
24 V encoder supply
● Short-circuit protection	Yes; per module, electronic	Yes; per module, electronic	Yes; Per load voltage, electronic
● Output current, max.	0.7 A; Total current of all encoders	0.7 A; Total current of all encoders	1.4 A; Total current of all encoders, max. 0.7 A per load voltage
Power loss
Power loss, typ.	2.5 W	2.5 W	4 W
Digital inputs
Number of digital inputs	4; Parameterizable as DIQ	4; Parameterizable as DIQ	16; Parameterizable as DIQ
Input characteristic curve in accordance with IEC 61131, type 3	Yes	Yes	Yes
Number of simultaneously controllable inputs
all mounting positions
— up to 55 °C, max.	4	4	16
Digital input functions, parameterizable
● Freely usable digital input			Yes
● Counter			Yes
— Number, max.			4
— Counting frequency, max.			2 kHz
— Counting width			32 bit; Incl. sign
— Counting direction up/down			Yes
Input voltage
● Type of input voltage	DC	DC	DC
● Rated value (DC)	24 V	24 V	24 V
● for signal "0"	-3 to +5V	-3 to +5V	-3 to +5V
● for signal "1"	+11 to +30V	+11 to +30V	+11 to +30V
Input current
● for signal "1", typ.	3.2 mA	3.2 mA	3 mA
Input delay (for rated value of input voltage)
for standard inputs
— parameterizable			Yes
— at "0" to "1", min.	1.2 ms	1.2 ms	0.05 ms; 1.6 ms for channels 8 through 15
— at "0" to "1", max.	4.8 ms	4.8 ms	20 ms
— at "1" to "0", min.	1.2 ms	1.2 ms	0.05 ms; 1.6 ms for channels 8 through 15
— at "1" to "0", max.	4.8 ms	4.8 ms	20 ms
for counter/technological functions
— parameterizable			Yes
Cable length
● unshielded, max.	30 m	30 m	30 m
Digital outputs
Number of digital outputs	8; 4 DQ fixed, 4 DIQ parameterizable	8; 4 DQ fixed, 4 DIQ parameterizable	16; Parameterizable as DIQ
● in groups of	4; 2 load groups for 4 outputs each	4; 2 load groups for 4 outputs each	8; 2 load groups for 8 outputs each
Short-circuit protection	Yes; per channel, electronic	Yes; per channel, electronic	Yes; per channel, electronic
● Response threshold, typ.	0.7 A	0.7 A	0.7 A
Limitation of inductive shutdown voltage to	2L+ (-47 V)	2L+ (-47 V)	L+ (-53 V)
Digital output functions, parameterizable
● Switching tripped by comparison values			Yes
● Freely usable digital output			Yes
Switching capacity of the outputs
● on lamp load, max.	5 W	5 W	5 W
Load resistance range
● lower limit	48 ?	48 ?	48 ?
● upper limit	4 k?	4 k?	4 k?
Output voltage
● for signal "1", min.	L+ (-0.8 V)	L+ (-0.8 V)	L+ (-0.8 V)
Output current
● for signal "1" rated value	0.5 A	0.5 A	0.5 A
● for signal "0" residual current, max.	0.5 mA	0.5 mA	0.5 mA
Switching frequency
● with resistive load, max.	100 Hz	100 Hz	100 Hz
● with inductive load, max.	0.5 Hz	0.5 Hz	0.5 Hz
● on lamp load, max.	1 Hz	1 Hz	1 Hz
Total current of the outputs
● Current per group, max.	2 A	2 A	4 A
Cable length
● unshielded, max.	30 m	30 m	30 m
Encoder
Connectable encoders
● 2-wire sensor	Yes	Yes	Yes
— permissible quiescent current (2-wire sensor), max.	1.5 mA	1.5 mA	1.5 mA
Interrupts/diagnostics/status information
Substitute values connectable	Yes; channel by channel, parameterizable	Yes; channel by channel, parameterizable	Yes; channel by channel, parameterizable
Alarms
● Diagnostic alarm	Yes; Parameterizable	Yes; Parameterizable	Yes; Parameterizable
Diagnostic messages
● Short-circuit	Yes; Outputs to M; encoder supply to M; module by module	Yes; Outputs to M; encoder supply to M; module by module	Yes; Outputs to M; encoder supply to M; module by module
Diagnostics indication LED
● Channel status display	Yes; Green LED	Yes; Green LED	Yes; Green LED
● for module diagnostics	Yes; Green/red LED	Yes; Green/red LED	Yes; Green/red LED
● For load voltage monitoring	Yes; Green LED	Yes; Green LED	Yes; Green LED
Potential separation
between the load voltages	Yes	Yes	Yes
Potential separation channels
● between the channels, in groups of	4; DIQ channels are isolated from DQ channels	4; DIQ channels are isolated from DQ channels	8
● between the channels and backplane bus	Yes	Yes	Yes
● between the channels and the power supply of the electronics	No; DIQ channels are non-isolated and DQ channels are isolated from supply voltage 1L+	No; DIQ channels are non-isolated and DQ channels are isolated from supply voltage 1L+	No; 8 channels are non-isolated and 8 channels are isolated from supply voltage 1L+
Isolation
Isolation tested with	707 V DC (type test)	707 V DC (type test)	707 V DC (type test)
Degree and class of protection
Degree of protection acc. to EN 60529
● IP65	Yes	Yes	Yes
● IP67	Yes	Yes	Yes
Standards, approvals, certificates
Suitable for safety-oriented group deactivation	Yes	Yes
Highest safety class achievable in safety mode
● Performance level according to ISO 13849-1	PL d	PL d
● SIL acc. to IEC 61508	SIL 2	SIL 2
Ambient conditions
Ambient temperature during operation
● min.	-25 °C	-25 °C	-25 °C
● max.	55 °C	55 °C	55 °C
Connection method
Design of electrical connection for the inputs and outputs	M8, 3-pole	M12, 5-pole	M12, 5-pole
Power supply	M8, 4-pole	M8, 4-pole	M8, 4-pole
ET-Connection
● ET-Connection	M8, 4-pin, shielded	M8, 4-pin, shielded	M8, 4-pin, shielded
Dimensions
Width	30 mm	30 mm	45 mm
Height	159 mm	159 mm	159 mm
Depth	40 mm	40 mm	40 mm
Weights
Weight, approx.	145 g	145 g	195 g