Fanuc IC655MDL503 PLC

This module provides 64 circuits for connection to user input devices. 32 LEDs on the module indicate the status of the 32 Inputs associated with one connector. A toggle switch above the top (Jl) connector allows the user to choose the group of inputs being monitored (A to D, or E to H). The top 16 LEDs perform a dual function. They normally provide a visual indication of the status of each input circuit with each LED reflecting the GN or OFF state of the corresponding circuit. Second, when commanded through programming, they indicate the starting I/O address for the module.

Field wiring connections from input devices is made to two 37,pin subminiature D-type connectors (labeled Jl (A-D) and 32 (E-H)), mounted on the front of the module. One connector is used for two groups with 16 inputs in each group. The four groups are labeled A and B (group l), C and D (group 2), E and F (group 3), and group 4 is G and H. The pins in each group are labeled 1 to 8, for example: group 1 is Al to A8 and B 1 to B8. Each group has a common connection, labeled C. The user must supply the source of power, which can be from 20 to 28 VDC, to reflect the state of the inputs to the module. All groups can be powered from a common source or from different sources. The circuits can operate as either positive or negative logic, depending on how the source voltage is connected to the module. Examples of these connections are shown in the following wiring diagram for the module.