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IO read access error in FB613 affecting OB30 execution

Created by: DADHICH at: 6/4/2023 9:06 AM (8 Replies)

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6/4/2023 9:06 AM	Rate (0)
DADHICH Posts: 2 Rating: (0)	Red Error coming in CPU1512SP and showing error: Temporary CPU error : I/O read access error (I address 0) in FB613 affecting OB30 incorrect address, operand ignored. Help on this to resolve this issue. Attachment IMG_20230603_232458.jpg (884 Downloads)
DADHICH Posts: 2 Rating: (0)
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6/4/2023 10:33 AM	Rate (0)
ixo65 Grandmaster Joined: 12/18/2014 Last visit: 1/15/2026 Posts: 36458 Rating: (4550)	And why write you this topic in the SIMATIC S5 / STEP 5 conference?

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6/5/2023 3:26 PM	Rate (0)
0_Einstein Grandmaster-Expert Joined: 7/7/2010 Last visit: 1/14/2026 Posts: 16369 Rating: (2522)	What in FB613 called from OB30 is using I0.n? What device is configured for I0.n? Is a remote Input module configured for I0? If so, before calling FB613 from OB30, make sure the remote input module is online. I recently had to add similar logic before accessing VFD telegram data and generating 1600 diagnostics entries in a very short period of time. DADHICH Red Error coming in CPU1512SP and showing error: Temporary CPU error : I/O read access error (I address 0) in FB613 affecting OB30 incorrect address, operand ignored. Help on this to resolve this issue.
	science guy
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7/14/2023 11:35 AM	Rate (0)
GregW1179 Advanced Member Joined: 4/8/2010 Last visit: 12/4/2024 Posts: 2 Rating: (0)	Did you solve this problem? It was releted with PtP communication?

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3/19/2024 1:43 PM	Rate (0)
annai Posts: 2 Rating: (0)	多数情况下是因为装载指令没有初始化完成，主站就被开始执行轮询命令了，所以查找错误的方向应该是轮询命令触发时，装载命令是否执行完成。In most cases, the load command is not initialized and the master is started to execute the polling command, so the direction to look for the error should be whether the execution of the load command is completed or not when the polling command is triggered.
annai Posts: 2 Rating: (0)
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3/20/2024 5:09 AM
annai Posts: 2 Rating: (0)	In most cases, the load command is not initialized and the master is started to execute the polling command, so the direction to look for the error should be whether or not the execution of the load command is completed when the polling command is triggered.
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9/6/2024 8:09 PM	Rate (0)
AutoGen_8288389 Member Joined: 4/9/2020 Last visit: 12/21/2025 Posts: 3 Rating: (0)	Hello, I have very similar problem with communication using Modbus RTU. et200SP and PAC1020 via 6ES7 137-6AA01-0BA0 Software was made using Tia Portal V18 Update 3. Communication was working fine since I made PLC to the STOP mode and after that it is not working Temporary CPU error: I/O read access error (I address 0) in FB 613 affecting OB 1 execution Incorrect address, operand ignored I don't know if this is important but I made and upgrade to TIA V18 Update 4. In attachment please find screens from TIA V18 Attachment (5).png (426 Downloads)

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11/12/2025 8:47 PM	Rate (0)
EveraldoMarques Advanced Member Joined: 7/28/2014 Last visit: 11/12/2025 Posts: 3 Rating: (1)	I'm also having the same problem. Did you manage to solve it?

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11/12/2025 9:27 PM	Rate (0)
0_Einstein Grandmaster-Expert Joined: 7/7/2010 Last visit: 1/14/2026 Posts: 16369 Rating: (2522)	If you did not manage to fix it, did you replace the "constant" 266 with the SYSTEM Constant with the value of 266 (presumably the COMM Module hardware address)? AutoGen_8288389 Hello, I have very similar problem with communication using Modbus RTU. et200SP and PAC1020 via 6ES7 137-6AA01-0BA0 Software was made using Tia Portal V18 Update 3. Communication was working fine since I made PLC to the STOP mode and after that it is not working Temporary CPU error: I/O read access error (I address 0) in FB 613 affecting OB 1 execution Incorrect address, operand ignored I don't know if this is important but I made and upgrade to TIA V18 Update 4. In attachment please find screens from TIA V18
	science guy
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