Allen Bradley 1756-OB8 Digital DC output module

FAQ

Q1: What is the main purpose of the 1756‑OB8 module?
It provides eight discrete DC output channels for driving external loads such as relays, solenoids, and actuators.

Q2: What DC voltage range does this module support?
It operates over approximately 10 – 31.2 V DC with a nominal 12/24 V supply.

Q3: How much current can each output channel deliver?
Each output can source up to around 2 A per point at 30 °C, with derating at higher temperatures.

Q4: Does the module provide isolation?
Yes, it provides continuous isolation (~250 V) between the output circuits and the backplane.

Q5: Does this module require separate power for outputs?
Yes — the DC outputs require an external DC power source (typically 24 V DC).

Q6: How is the module wired to field devices?
Field wiring connects through a removable terminal block such as 1756‑TBCH or 1756‑TBS6H.

Q7: What are the environmental operating limits?
It operates from 0 °C to 60 °C and can be stored from –40 °C to 85 °C with up to 95 % non‑condensing humidity.

Q8: What are the typical size and weight of the module?
Dimensions are roughly 300 mm × 38 mm × 111 mm and weight is about 0.30–0.35 kg.

1756-OB8 Allen Bradley

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