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How many CPU scans does it take a CPU to respond to a PLC ModbusTCP request?

This depends if the communications service is embeeed into a CPU or acts indepentanly as an option module.
Quantum Varies with CPU scan and buffer servicing with response at end of CPU scan
Premium Responses answered in by end of next CPU scan up to buffer limits. Exception response returned
Momemtum May take several CPU M1 CPU scans due to connection setup and teardon between reqeusts on single CPU device

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