Micromod Micro-DCI: 53MC5000 PLC AND PRINTER INTERFACES - Manual (Page 11)

1.0 INTRODUCTION
1.1 OVERVIEW
The 53MC5000 Process Control Station (PCS) DDI-A
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Printer/PLC option and the DDI-B
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Printer/PLC option each provide the capability to transfer logical bit indicators and floating point
variables to or from a Programmable Logic Controller (PLC). The DDI-A/B Printer/PLC options
also provide the capability to send serial output PCS datalog information to a printer.
PLC types that the PCS can communicate with are Allen-Bradley, Modbus RTU, Siemens S5, and
Koyo. In Modbus RTU mode, the PCS can be configured to function as a Modbus master or as a
slave. The PCS can also communicate with OPTO 22 digital and analog brain boards.
All data transfers (with the exception of Modbus slave operation) are initiated by the PCS and are
with respect to the PCS: writing means that data is output from the PCS option to an addressed
PLC and reading means that requested data is input to the PCS from the PLC. Additional PCS
DDI-A/B information is provided in Section 3, Product Description.
1.2 DDI-A/B HARDWARE DESCRIPTION
As shown in Figure 1-1, hardware elements of the DDI-A/B options include the DDI-A and DDI-B
Auxiliary Processor Boards (APBs) and the RS-232/485 Interconnection Terminal Boards (ITBs).
The APBs are installed in Expansion Board slots 3 and 1 respectively for DDI-A and DDI-B. There
is an RS-232/485 ITB mounted external to the PCS on 2.9 inch (74 mm) wide PVC track for each
DDI option. Each ITB is cable connected to the rear of the PCS. An ITB cable can be ordered with
the option. Also required for each option, is a custom fabricated cable that connects from the ITB
to the PLC or printer serial/parallel converter. The custom fabricated cable is supplied by the user;
cable diagrams are provided in the PLC and printer interface sections of this book.
1.3 FIELD UPGRADE INFORMATION FOR EXISTING PCS UNITS
This information only pertains to existing 53MC5000 PCS controllers that will be field up-
graded with one or both PLC DDI options (DDI-A/B). Continue to Section 1.4, RS-232/485 ITB
Specifications, if the PCS came with the PLC DDI-A/B options preinstalled.
The Printer/PLC DDI-A and DDI-B options require the following:
• A PCS that has an Exapansion board.
• A Main board firmware level of 4 (datapoints B382 = 4 and B383 = 29 or higher). Figure 1-1
shows the PROM chip location on the Main board.
• A firmware level of 1 for each APB (DDI-A datapoint B297 = 27 or higher and DDI-B data-
point B463 = 27 or higher).
Section 1. Introduction
INTRO
1-1
(1) DDI-A = Digital Device Interface - A
(2) DDI-B = Digital Device Interface - B