West Control Solutions MRC 8000 - Manual (Page 17)

17
FIGURE 2-10
Digital Communications Options
Connections are made as shown using TB2. Refer to the Protocol Manual, Form #2878 for
more details regarding the connections and how to use this option. This document is provided
only when this option has been specified. If the communications network continues on to other
instruments, connect the cable shields together, but not to the instrument. A terminating
resistor should be installed at the terminals of the last unit in the communications loop. If the
communications network ends at the instrument, the shield is not connected.
2.6.4 OUTPUT CONNECTIONS
Relay output(s), if provided in the instrument, may be assigned to control or alarm output
functions for Pen 1 and/or Pen 2 (if present). Current outputs may be assigned to control and
process value retransmission output for Pen 1 and/or Pen 2 (if present). The assignment of
the output function (s) are/is accomplished in the Program mode. SPST relay and/or SSR
driver output(s) is/are designated as Relay A through Relay D.
FIGURE 2-11
SPST Relay Output
Connections are made to relays A through D as shown. Terminal connections are made using
TB6 (Relay/SSR Driver A, B) and TB7 (Relay/SSR Driver C, D).
TOWARD THE
COMPUTER
TB2
1 2
NETWORK
CONTINUATION
(IF APPLICABLE)
Serial A Serial B
1 2 3 4
LOAD
POWER
HOT
NEU
5 AMPERES
MAXIMUM
AT 115 VAC
N.O. C N.O. C
TB6 Relay A & B, Relay A Terminals 1 & 2
TB7 Relay C & D, Relay C Terminals 1 & 2