The PLC 1756-L55M14 is a ControlLogix 5555 controller. This Series A controller has an available data and logic memory of 3.5 Mbytes and an I/O memory of 208 kbytes. It should be noted that the 1756-L55M14 controller does not have a nonvolatile memory.
The controller is placed inside a ControlLogix 1756 chassis and has an open style enclosure. By itself, the controller weighs 0.36 kg or 12.8 oz. Its battery can be replaced with a 1756-BA1 lithium battery. You should remember to replace the controller's battery only when it is necessary. The only serial cables compatible with the 1756-L55M14 controller are either the 1756-CP3 or 1747-CP3 cables.
This controller has the capability to support various communication modes, such as SynchLink, DH-485, Modbus via ladder routine, Universal Remote I/O serial, Data Highway Plus, DeviceNet, ControlNet, and EtherNet/IP. It can also be used in a redundant system as long as you pair it with the same controller and is found within the same ControlNet network.
