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Mitsubishi A2SH(1) One frame, no expansion. Besides P/S and CPU it is populated with two X42 and two Y42 I/O cards and one blank left over.
Network type set as "None" in parmeters. All other parameters are at factory default. Using GX Developer V7.11M
Application: This PLC used to control product conveyance and automatic handling through machine by means of cylinders, actuators, position sensors, etc. Nothing unusual.
Problem: I have been assigned to modify one part of the product handling motion. I am not the original author of this code. In the rungs I need to modify there are "B" network link contacts controlling the action. Since there is no corresponding local "coil" in this program that usually means these contacts are controlled elsewhere on the network. Since there is no network, I am perplexed as I monitor and watch these B network link contacts go on and off as the program runs.
Question: How (or where) else might these B network be controlled? Obviously I need to fill a gap in my knowledge of how this works. I have been scratching my head alot on this one.
Thanks for the help.
Network type set as "None" in parmeters. All other parameters are at factory default. Using GX Developer V7.11M
Application: This PLC used to control product conveyance and automatic handling through machine by means of cylinders, actuators, position sensors, etc. Nothing unusual.
Problem: I have been assigned to modify one part of the product handling motion. I am not the original author of this code. In the rungs I need to modify there are "B" network link contacts controlling the action. Since there is no corresponding local "coil" in this program that usually means these contacts are controlled elsewhere on the network. Since there is no network, I am perplexed as I monitor and watch these B network link contacts go on and off as the program runs.
Question: How (or where) else might these B network be controlled? Obviously I need to fill a gap in my knowledge of how this works. I have been scratching my head alot on this one.
Thanks for the help.