Micromod Micro-DCI: 53MC5000 PLC AND PRINTER INTERFACES - Manual (Page 82)

6.5.4 PCS MODBUS SLAVE SET-UP PROCEDURE
The Modbus PLC documentation must be referenced to install and configure the PLC.
1. Reference the 53MC5000 Process Control Station book listed in the Preface to install the PCS.
2. See Section 2 of this book to mount the RS-232/485 ITB and cable connect it to the PCS.
3. This section provides an illustration of the required custom RS-232 cable if J1 of the ITB is to
be connected to the PLC; otherwise, the standard RS-485 four wire bundle can be used if TB2
is to be connected to the PLC.
4. See Section 2 of this book for the required power connections to the RS-232/485 ITB.
5. Define the PLC memory map as determined from the quantity of L-bytes and C-words to be
transferred between the PCS and PLC. The size and address locations of the PCS L- and C-
memory areas are defined in Section 6.5.1.
6. At the PCS, configure all of the appropriate DDI channel datapoints set by the user as follows:
PCS APB Setup Bytes (Table 6-8)
Mode (B290, B456) - 0 (to ensure interface is off.)
Baud Rate (B292, B458) - Set to match the PLC.
Set-Up (B293, B459) - Data format transfer protocol is set to match the PLC.
Self Address (B295, B461) - Use the assigned PCS slave address.
PLC Control and Status Bytes (Table 6-9)
Scan Time (B685, B661) - See Section 3.7 to calculate the Scan Time.
APB Setup Bytes (Table 6-8)
Mode (B290, B456) - 3 to start the Modbus RTU PLC interface protocol.
RS-232/485 ITB
XMT (CR13) and RCV (CR14) LEDs alternately blink whenever there is PCS-PLC
activity.
53MC9015 53MC5000 PLC and Printer Interfaces
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MODBUS2