Modus Master/Slaves Serial Port Mode (Private Serial Bus) - Pepperl+Fuchs ICDM-RX/MOD Manual

ICDM-RX/MOD User Manual
Overview
• Verify the valid device ID ranges are sufficient to address all serial devices.

1.8. Modus Master/Slaves Serial Port Mode (Private Serial Bus)

As of Modbus Router v5.10, Modbus masters and slave(s) can be connected together on the same serial port.
This provides the following benefits:
1. A serial Modbus master can communicate to slaves on its' own private serial bus as well as public slaves on
a Modbus network. In this configuration, a serial master can communicate to:
a. Modbus RTU/ASCII slave(s) on its own serial bus.
b. Public Modbus RTU/ASCII serial slave(s) connected to the same ICDM-RX/MOD.
c. Modbus/TCP slaves.
d. Remote public Modbus RTU/ASCII serial slave(s) via an Ethernet attached Modbus gateway.
e. All other Modbus master(s) on the Modbus network via the Shared Memory functionality.
2. The Modbus slaves on the serial bus are private to the master on that serial bus.
a. The slave device(s) are affectively protected from all other Modbus masters on the Modbus network.
b. The master has total control of communication to the slaves on its own serial bus.
c. The master can provide data to/from the slave(s) to the Modbus network, and other Modbus masters,
via the Shared Memory functionality.
3. Deployment can be greatly simplified.
a. An existing serial bus can be left intact, thusly reducing the rewiring effort.
b. The only wiring change is to attach the ICDM-RX/MOD to the bus anywhere there is access.
4. The system can be more fault-tolerant.
a. In the event the ICDM-RX/MOD is powered off, the master and slaves on the serial bus can still
communicate.
b. By preventing other masters from communicating to the slave devices on the serial bus:
• Other masters cannot cause disruptions in communications between the master and slaves on the
serial bus by overloading the gateway.
• Message latency time between the master and slaves is minimized.
5. Maintenance and downtime costs can be minimized with detailed diagnostics web pages provided by the
ICDM-RX/MOD.
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