GE IS420YDOAS1B Digital output module

Product manual:

Digital signal output: This module is capable of generating a digital signal, usually a relay contact output or a transistor output. Used to control field actuators, such as solenoid valves, contactors, relays, etc.
Control signal transmission: The instructions issued from the control system are converted into the appropriate electrical signals. To drive field equipment, such as starting or stopping motors, opening or closing valves, etc.
Safety and protection: Modules may contain circuit designs. Such as isolation circuit. To protect the control system from electrical interference or damage to field equipment.
Redundant design: in critical systems. The digital output module may be designed in a redundant configuration, i.e. dual channel output. Ensure that the system can maintain normal operation even if a single module fails.
Status feedback: although mainly the output module. But some designs may also provide state feedback signals back to the control system. Verify that the output signal is executed correctly.

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