DSS EX Explosion-Proof Transmitter and Controller Instruction Manual
54
Setting Up the Interlock Relay (Force On) Feature
Relays 1-4 can be set up as interlock relays. To set up the relays for the interlock feature:
1. Access the
Setup
–
Relay
–
Action
menu and set the action to off.
2. In the Advanced features –
User
menu, program any of the digital inputs to
Force On
any of the
internal relays (1-4). The Advanced Features Menu can be found on page 57.
3. Connect a switch or dry contact between the +5V terminal and the corresponding digital input (dI-1 to
dI-4) terminal.
Interlock Relay Operation Example
Relays 1 & 2 are configured to energize (their front panel LEDs are off) when SW1 & SW2 switches (above)
are closed. If the contacts to these digital inputs are opened, the corresponding front panel LEDs flash,
indicating this condition. The processes being controlled by the interlock relay will stop, and will re-start only
after the interlock relay is re-activated by the digital inputs (switches).
Note: If multiple digital inputs are assigned to the same relay, then the corresponding logic is (AND) – i.e.
both switches must be closed to trip the relay.
1
2
3
4
5
6
+5
I1
I2
I3
I4
O1
7
8
O2
O3
9
10
O4
G
DI 1-4
DO 1-4
5 VDC
GND
SW2
SW1
