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PLC S5 Problem HELP!

Created by: Ing. Hass at: 10/23/2011 1:49 AM (9 Replies)

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10/23/2011 1:49 AM	Rate (0)
Ing. Hass Posts: 50 Rating: (0)	good day I write because I need a S5 PLC, as this presents a problem when reading certain digital inputs for 3 days, the strange thing is that the green LED indication that the input is active on and turns off every time I send the signal, but in the PLC program in Step 5 does not show the result is, if the input on or off (0 or 1), I have made several changes, change the rack cards that have flaws and even change the digital input for a new and equally I reloaded the complete program of PLC and also change the font without positive results, thank you very much for your help.
Ing. Hass Posts: 50 Rating: (0)
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10/23/2011 7:02 AM	Rate (0)
kk cheung Experienced Member Joined: 1/14/2006 Last visit: 2/14/2022 Posts: 37 Rating: (1)	Are you sure you can access your input card? Try instructions such asL PIWxx to see if the CPU stops.
	Last edited by: kk at: 10/23/2011 7:05 AM
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10/23/2011 2:42 PM	Rate (0)
Ing. Hass Posts: 50 Rating: (0)	if I can access the digital and analog inputs, only the LED indication that the input is active in the program on and I show that this activity, it remains all the time the bit to 0 thanks for your help
Ing. Hass Posts: 50 Rating: (0)
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10/24/2011 9:47 AM	Rate (0)
DolaMam Experienced Member Joined: 6/22/2009 Last visit: 6/6/2025 Posts: 63 Rating: (3)	What is the type no.of the module? How the input power supply is given (from PLC or from external source?). Also check the M (0 V) point is grounded asrecommended in manual.

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10/24/2011 11:05 PM	Rate (0)
Ing. Hass Posts: 50 Rating: (0)	all power comes from the same source S5 PLC 6ES5-955-3LC14 is the internal source, also has 3 racks and racks with multiple CP, and the problem is on a single card that does not read the bits in the program, however LEDs are activated when the voltage reaches, thanks!
Ing. Hass Posts: 50 Rating: (0)
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10/28/2011 1:21 AM	Rate (0)
Zenta Silver Member Joined: 10/12/2006 Last visit: 6/18/2025 Posts: 206 Rating: (26)	Hi, do you have any active output? Maybe the CPU lost the program? Regards Zenta

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10/31/2011 7:29 AM	Rate (0)
DolaMam Experienced Member Joined: 6/22/2009 Last visit: 6/6/2025 Posts: 63 Rating: (3)	Hi, Sorry to reply late. What is the type no.(6ES5......) of the card that is giving problem? Also, could you upload a snapshot of the BSTACK and ISTACK?

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10/31/2011 12:45 PM	Rate (0)
Navnag Platinum Expert Joined: 11/21/2007 Last visit: 7/25/2025 Posts: 2326 Rating: (309)	Dear Hass I am not sure which card you are using, but from your description, I understand that this is a S5 135U / 155U system. Most I/O Modules have an Enable Pin ( Pin 1,2 ) which needs to be supplied with External Enable supply ( Or has to be shorted e.g. for AC Modules ). Check if this is OK Check if the DIP Switch settings on the card are OK Check the L PIW instruction ( As suggested earlier ) Lastly try to change the module Slot. Sometimes there is problem in the backplane connector. All the best Cheers Navnag
	Last edited by: Navnag at: 10/31/2011 12:47 PM There is no such thing as the last bug in a program There are no stubborn bugs, There are only stubborn Debuggers.
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10/31/2011 9:41 PM	Rate (0)
Ing. Hass Posts: 50 Rating: (0)	and solved the problem, install the two cards that were bad the old and new, place a new and served, thank you very much for your help!
Ing. Hass Posts: 50 Rating: (0)
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5/22/2018 7:38 AM	Rate (0)
Jen_Moderator Diamond Member Joined: 6/19/2017 Last visit: 9/6/2024 Posts: 8171 Rating: (174)	New question published by ANIL.kumar is split to a separate thread with the subject Red indication is continuously blinking with HMI communication error. Best regards Jen_Moderator

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