Wiring: Mitsubishi

Wiring: Mitsubishi

Revision: 4.9

Download this page along with the Notes and Memory Usage as a Microsoft Word file "Notes.doc" for best printing. This file is included on the disks that come with the MSP and with all driver downloads.

Sink/Source Inputs. The Inputs for the many Mitsubishi PLCs can be used as either sink or source. These are designated as "World Models". Each input is basically a resistor with one end of each resistor tied to individual terminals and the other ends are tied together to a terminal marked "S/S". The output on the MSP is also designed to be used as either sink or source. The MSP contains a sinking gate and pull-up resistor. Originally I used the FX as sink and the resistors in the MSP and FX formed a voltage divider. This light the LED on the front of the PLC but not the internal status on came from the optical isolator that went to the processor. I changed the FX to source so both resistors formed pull-ups and everything worked fine.

The FXo that was used for development was a sink only model. These are designated as "North American Models". The sink input is not just a simple pull up down resistor, unconnected it pulls-up to 24V. Also the input's "COM" is tied internally to 24VDC common. The FXo North American Model worked fine with the MSP in this mode. On the North American module we had to negate the inputs.

Note: the true/false sense for inputs is opposite in the World and North American models. The ladder logic the output may have to be negated to provide the proper logic sense.

Make sure that the PLC input module and MSP input get their 24 VDC from the same source. Following is a schematic of a typical input. "X?" may be any valid input. In the driver library Channel 1 and 2 are X0 and X1 respectively but may be changed if desired.

World Model - Sink/Source Input

North American Model - Sink Only Input

Sink/Source Outputs. The input on the MSP is sink; it is basically a resistor tied to -VDC or common. On those units designated as "World Model" the output is source and the MSP can be wired directly to the PLC. On those units designated as "North American Model" the output is sinking therefore pull-up resistor must be used when connecting an MSP.

Note: the true/false sense for inputs is opposite in the World and North American models. The ladder logic the output may have to be negated to provide the proper logic sense.

Make sure that the PLC output module and MSP output get their 24 VDC from the same source. Following is a schematic of a typical output. "Y?" may be any valid input. In the driver library Channel 1 and 2 are Y0 and Y1 respectively but may be changed if desired.

World Model - Source Output

North American Model - Sink Output

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