Discrete Interface - CPI S5CIA Installation And Operation Manual

E I
XTERNAL NTERFACES
3.1.4

Discrete Interface

The operator may wish to monitor several critical internal fault or alarm parameters using dry
contacts. Alarms and faults can be programmed to dry contacts.
The pin-out for connector J6 is shown in Table 3-2.
The discrete interface, allows very simple remote monitoring of amplifier status and health by a
simple PLC or current loop implementation by the operator.
There are 4 dry contact relay outputs available to the user. Both normally open (NO) and
normally closed (NC) contacts are provided. Not every Fault or Alarm is to be monitored by
the discrete relay contacts. Please consult Table 3-3, for a complete list of faults and alarms that
can be mapped to any of the four relay outputs.
The desired pin-out monitoring is chosen via the front panel menu item.
Typically, the NC contacts are used, and a loop current is run through the contacts. When the
amplifier is running without faults, software enables all the relays, the NC contacts are closed,
and current flows in the loop. If a fault occurs, the contacts will open and interrupt the loop
current, signaling an alarm to the external monitoring circuit. Note this allows detection of
amplifier faults, general amplifier failure, power failure and broken or disconnected monitoring
circuit. Use of the NO contacts will only protect against amplifier faults.
3-4
Table 3-2. J6 Discrete Interface Pin Out
Pin Number
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Function
Relay 1 COM
Relay 1 NO
Relay2 NC
Relay 3 COM
Relay 3 NO
Relay 4 NC
Not Connected
Not Connected
Relay 1 NC
Relay 2 COM
Relay 2 NO
Relay 3 NC
Relay 4 COM
Relay 4 NO
No Connect
D .01040045 R .6
OC EV