Instruction Manual

4–4 Installation/Wiring for PLC Control Drives
Circuits must be capable of operating with high = true logic.
DC external circuits in the low state must generate a voltage of no
more than 8V DC. Leakage current must be less than 1.5 mA into a
2.5k ohm load.
DC external circuits in the high state must generate a voltage of +20
to +26 volts and source a current of approximately 10 mA for each
input. The PLC control version is compatible with these
Allen-Bradley PLC modules:
• 1771-OB • 1771-OQ16 • 1771-OB16
• 1771-OBD • 1771-OYL
• 1771-OBN • 1771-OZL
• 1771-OQ • 1771-OBB
The 24 volt power supply is capable of supplying a total of 16 digital
inputs.
Typical
20 21 22 23 24 25
0.22 µ f
1k
20k
510
510 510
TB5 TB7
24V Common 24V
1
Only used if 3-Wire Input Mode selected
11
Contacts shown are general, refer to Input Mode Select and information presented above.