The 1756-A4 is a module used in Allen Bradley's ControlLogix series of programmable logic controllers (PLCs).
The 1756-A4 is a module used in Allen Bradley's ControlLogix series of programmable logic controllers (PLCs). It is a chassis-based module used for housing and powering other modules within the ControlLogix system. The 1756-A4 provides a slot for installing control and communication modules, allowing for flexible configuration and expansion of the PLC system.
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