bigsteve
Member
I am working on a project where an AB Guardmaster 440C is the logic solver for some SIL-rated interlocks. I need to be able to send reset bits over Modbus from a Micro870 PLC. I've got the 1761-BL-HM02 cable connecting the 8-pin serial ports. I've got the code going on the Micro870 ladder logic, and it's not giving an error, but I am not getting any data transfer.
My serial port settings on the 870:
https://drive.google.com/file/d/1uu3Exebc7hjMABDKiyaMAK9xBT01qM-H/view?usp=share_link
Modbus command configuration values:
https://drive.google.com/file/d/1Z6zX7GwdmVtQ-jxuEiLF5vwRzDLG_YL_/view?usp=share_link
Ladder logic line:
https://drive.google.com/file/d/1JuymC8tUWFPXlo11GBZPMYrC4U763LT6/view?usp=share_link
I'm having the same problem writing to the 440C.
I'm hoping it's something simple that I'm overlooking; I've got the ladder logic set up just like the example in the 440C manual, but there's not much information on the mechanics of it all.
Thank you!
My serial port settings on the 870:
https://drive.google.com/file/d/1uu3Exebc7hjMABDKiyaMAK9xBT01qM-H/view?usp=share_link
Modbus command configuration values:
https://drive.google.com/file/d/1Z6zX7GwdmVtQ-jxuEiLF5vwRzDLG_YL_/view?usp=share_link
Ladder logic line:
https://drive.google.com/file/d/1JuymC8tUWFPXlo11GBZPMYrC4U763LT6/view?usp=share_link
I'm having the same problem writing to the 440C.
I'm hoping it's something simple that I'm overlooking; I've got the ladder logic set up just like the example in the 440C manual, but there's not much information on the mechanics of it all.
Thank you!
