Yes, the CPU can act as both a Modbus Master and Slave at the same time.
For example you may connect the CPU via RS232 programming lead to one of our HMI’s, and set it to act as a Modbus RTU Slave.
At the same time, you could have an RS485 expansion module attached to the CPU acting as a Modbus RTU Master to other CPU’s or Modbus Slaves.

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