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S7-1200 About Read LED status

Created by: AnproScott at: 6/28/2012 3:08 AM (5 Replies)

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6/28/2012 3:08 AM	Rate (0)
AnproScott Advanced Member Joined: 5/31/2007 Last visit: 9/18/2024 Posts: 90 Rating: (2)	Hello, my men, File attachment. I got a problem when I using function "LED"(Read LED status) from library in STEP7 V11 SP2. I used the "LED" function and "Ret_Val" returnerror code16#8091 orother error codes. I don't know for the parameter LADDR (Read LED status), what I should filled in??? I don'tknow what's the HW identifierof the CPU, either. And for parameter "LED" what I should filled in?? Please help me and give me specific solution. Thanks a lot. Attachment LED_READ.jpg (1343 Downloads)

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6/29/2012 2:51 PM	Rate (0)
Denilson Pegaia Platinum Expert Joined: 9/23/2005 Last visit: 1/13/2025 Posts: 4391 Rating: (1462)	Hi, I suggest you try to use the simbolic name of your cpu diagnose interface (e.g. PLC_1) as the direct number (65).
	Last edited by: Pegaia at: 6/29/2012 2:51 PM Denilson Pegaia Siemens Industry Sector Technical Support
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This contribution was helpful to 1 thankful Users HugoDu

11/9/2018 12:20 PM	Rate (0)
DiegoMaga Posts: 3 Rating: (0)	Denilson Pegaia Hi, I suggest you try to use the simbolic name of your cpu diagnose interface (e.g. PLC_1) as the direct number (65). Hi Denilson, I have tried to that, but was not sucessfull. Could you give a tip how can I do that ?
DiegoMaga Posts: 3 Rating: (0)
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11/9/2018 12:42 PM	Rate (0)
#dP Posts: 2826 Rating: (688)	Hello. diego_maga Denilson Pegaia Hi, I suggest you try to use the simbolic name of your cpu diagnose interface (e.g. PLC_1) as the direct number (65). Hi Denilson, I have tried to that, but was not sucessfull. Could you give a tip how can I do that ? Please consider showing the forum what you have and saying what you want. Unless the attached sample helps. BR Attachment read-led.pdf (638 Downloads)
#dP Posts: 2826 Rating: (688)
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11/9/2018 4:51 PM	Rate (0)
0_Einstein Diamond Expert Joined: 7/7/2010 Last visit: 12/23/2024 Posts: 15531 Rating: (2464)	Since this thread is quite old, I think maybe I can help with a quick "here is where you find what Denilson mentioned". Attached is an image showing what I believe Denilson was trying to help you understand. Avoid using the #65 when you can instead use the predefined system constant name which will remain the same within the same PLC family, but the constant value may change. Symbolic is preferred over hard-code for a few reasons. Name gives the reader context rather than a number where context would have to be documented in the network comments (and can be forgotten in the rush to commission) The name will not change, but the number might change with a different PLC hardware or firmware revision. This makes that set of program logic built around capturing and using the LED values more maintainable over time. It looks more professional not having values hard-coded (my opinion). diego_maga Denilson Pegaia Hi, I suggest you try to use the simbolic name of your cpu diagnose interface (e.g. PLC_1) as the direct number (65). Hi Denilson, I have tried to that, but was not sucessfull. Could you give a tip how can I do that ? Attachment LED_System_Constant_Selection.jpg (832 Downloads)
	science guy
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11/9/2018 5:02 PM	Rate (2)
#dP Posts: 2826 Rating: (688)	Hi huggy_d1. huggy_d1 Avoid using the #65 when you can instead use the predefined system constant name which will remain the same within the same PLC family, but the constant value may change I agree with the quoted sentiment. The 65 is however the wrong resource number. It is 50 (when speaking of a constant number). Please see the highlighted sentence in the attached document. It confirms the value of the document I shared earlier and it echoes your ideas. It also says which hardware resource name to be used. Have a good Friday. Attachment read-led-status.pdf (594 Downloads)
#dP Posts: 2826 Rating: (688)
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This contribution was helpful to 3 thankful Users 0_Einstein grrrrrroooo Serkan CANBAZ

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