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Old April 30th, 2018, 03:02 PM   #4
Steve Bailey
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Join Date: Apr 2002
Location: The boondocks of Western Massachusetts USA
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SRTP is GE's serial SNP protocol adapted for Ethernet TCP/IP. The 90-70 only ever supported SNP through the serial port on the CPU module and SRTP through the Ethernet module.
To use Modbus RTU you would need a communications coprocessor module IC697CMM711.
Or else check your documentation of the Siemens HMI to see if it supports communication with GE PLCs using SNP or SRTP.
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