User guide

AN24 & AN28 Annunciators Instruction Manual
15
COM
SIGNAL CONNECTOR
CH3 CH1CH2CH4
NPN
Transistor
C
B
EC
B
E
Figure 5. Open Collector NPN Transistor Inputs
Logic Level Inputs
Each logic level input is connected to an input channel with common as
the return.
Logic level inputs are factory set for normally high active logic level inputs.
For normally low input logic levels, program inputs for normally closed
input operation, see page 22.
Logic Level Low: 0 to 1.4 VDC
Logic Level High: 1.5 to 28 VDC
Input Impedance: Approximately 47 kΩ
Relays and 24 V Output Connections
Relay connections are made to a six-terminal connector labeled
RELAY1, RELAY2 on Figure 2. The COM (common) terminals of the
relays should not be confused with the COM (common) terminal of the
signal connector. The 24 VDC output is available at the connector
labeled 24V OUT, next to the relays connector.
24V OUT
P+ P-
RELAY 2 RELAY 1
NC NCCNO CNO
Figure 6. Relay & 24 V Output Connections