Micromod RetroPAK: SLC Installation Manual - Manual (Page 60)

SLC RetroPAK Controller
COMMUNICATIONS CONNECTIONS
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5.2 COMMUNICATION CONNECTION GUIDELINES
The wiring connections described in this section are made with the controller installed in its
operating location and with the power off. All connection terminals are located under a cover
on the back of the instrument housing. Figure 5-1 shows the communication connection
terminals with the cover removed.
The recommended procedure for making communications connections is as follows:
1. Communications port 1 serves the built-in communications circuits and is used for port 1.
2. Communications port 2 serves I/O module location S8 and S7, where the ICN
Communication Module is plugged in.
3. For communication port 1, a communications jumper on the carrier board, Figure 5-2, is
positioned to select RS-232 Modbus communication for the built-in circuits, to allow
connection of a portable computer through the front panel.
4. The built-in communications circuits are isolated from all other circuits. Terminal 1 (TX &
RX common) is the communications circuit common for these built in circuits. Connect
terminal 1 of each instrument on the communication bus together. This common line
must be connected to ground at some point in the system to prevent the possible build up
of a static charge, reduce noise pick up, and comply with EU EMC requirements.
5. Communications wiring should be shielded twisted pairs. Detailed cable requirements
are provided in Sections 5.4 and 5.5.
6. The cable shields must be connected to a good noise free ground. Normally this should
be one of the terminals identified as chassis in Figure 3-1. Alternatively, it is acceptable
to to use the shield to connect the commons among the instruments. If this arrangement
is used, noise rejection may not be optimal.
7. Route communications wiring from the top left hand side of the housing and distribute to
appropriate terminals.
8. Use a small, flat-head screwdriver to loosen appropriate connection screws and clamps
on terminal blocks.
9. Strip approximately 5/16 inch (8 mm) of insulation from the end of each wire, insert wires
at assigned terminals, and secure terminal screws and clamps.
10. Make wiring connections using the following procedures:
a. Front Panel RS-232 Communications Connections - Section 5.3.
b. Instrument Communications Network (ICN) Connections - Section 5.4.
11. After all connections are completed and checked, the ac power wiring can be connected
at the distribution panel (ac source).
* NOTE: Before putting the controller into operation, it must be configured using
the Visual Application Designer Software. See Section 1.1.2 for related
documents.