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Digital Output Cards S7 300 family

Created by: Pony at: 4/10/2009 12:21 PM (2 Replies)

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4/10/2009 12:21 PM	Rate (0)
Pony Posts: 13 Rating: (1)	All the Catalogues/manuals says that the we can operate all 32 channels of a 32 channel 24VDC/0.5A Digital Output Card simultaneously at 40 degree celcius & only 16 at 60 degree celcius. Can someone tell me the derating factor behind this...?? I have the ambient temp of 45 degree celcius at my clientssite & I want to know if i can use 28 channels per card which can be operated simultaneously...????
Pony Posts: 13 Rating: (1)
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4/18/2009 3:16 PM	Rate (0)
Ayman Elotaify Platinum Expert Joined: 5/28/2008 Last visit: 9/9/2024 Posts: 4515 Rating: (839)	Pony All the Catalogues/manuals says that the we can operate all 32 channels of a 32 channel 24VDC/0.5A Digital Output Card simultaneously at 40 degree celcius & only 16 at 60 degree celcius. Can someone tell me the derating factor behind this...?? I have the ambient temp of 45 degree celcius at my clientssite & I want to know if i can use 28 channels per card which can be operated simultaneously...???? Hello Pony, Please have a look on the attached datasheet. For DO 32 module, 24VDC/0.5A. That module consist of 4 groups. (8 outputs / group) And If the max. permissible current per output is 0.5 Amp. then the max. allawable current per group shouldn't exceed 0.5A * 8 = 4A. Thus in case the 8 DO is high at the same time and also if the load for each DO is 0.5A. All the above at ampient 40 deg. But please note that if these outputs will energize a contactor, relay, lamp,... etc. you have to know the current of each output. because may be the current do not reach to 0.5A. In any case, For 60 deg. The max. allawable current per group is 3A. It means 6 DO per group. i.e 24DO out of 32DO. Again you have to think of that all the DO signals would be high at the same time or not. and if not What's the max. number of DO signals that can be high together at the same time? And not each signals will consume 0.5A. Am I right? With best regards, Attachment S7_300_Baugruppendaten_e.pdf (182 Downloads)
	Last edited by: Ayman Elotaify at: 4/18/2009 3:17 PM Ayman Elotaify
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9/28/2015 9:09 AM	Rate (0)
Min_Moderator Platinum Member Joined: 9/3/2014 Last visit: 3/13/2019 Posts: 4767 Rating: (123)	New question published by mehdi607 is split to a separate thread with the subject Digital output card, all LED are low- light green. Best regards Min_Moderator

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