Interlock Relay Feature - Siemens SITRANS RD300 Operating Instructions Manual

SITRANS RD300
1 2 3 4 5 6 7 8 9 10
+5 I1 I2 I3 I4 O1 O2 O3 O4 G
DI 1-4 DO 1-4
5 VDC GND
Digital I/O Module Connections

Interlock Relay Feature

As the name implies, the interlock relay feature reassigns one, or more,
alarm/control relays for use as interlock relay(s). Interlock contact(s) are
wired to digital input(s) and trigger the interlock relay. This feature is
enabled by configuring the relay, and relative digital input(s) (see page
56). In one example, dry interlock contacts are connected in series to
one digital input which will be used to force on (energize) the assigned
interlock power relay when all interlock contacts are closed (safe). The
interlock relay front panel LED flashes when locked out. The interlock
relay would be wired in-series with the load (N/O contact). See below.
Interlock Connection
A5E31917845 SITRANS RD300 – OPERATING INSTRUCTIONS Page 13