Wiring: Omron

Wiring: Omron

Revision: 4.6

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. Almost all DC inputs in Omron PLCs can be used for either sink or source. We have used them only for sink. See the next note on Sinking inputs for a schematic and more details.

Sink Inputs. Each input is basically a resistor with one end of each resistor tied to individual terminals. The other ends are tied together to a terminal marked "Com". This pull down resistance sinks voltage and current to common VDC.

The output on the MSP is designed to be used as either sink or source. The MSP contains a sinking gate and pull-up resistor. Sink inputs can be wired directly to the MSP.

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. "0.?" may be any valid input. In the single channel drivers for the CPM1 the input is 0.00 but may be changed if desired. In the multiplexed drivers for the CPM1 Channel 0 and 1 are 0.00 and 0.01 respectively but may be changed if desired. Note that the input resistance is different depending on the input used. This does not effect the MSP.

Source Inputs. Each input is basically a resistor with one end of each resistor tied to individual terminals. The other ends are tied together to a terminal that is tied to COM. This pull up resistance sources voltage and current from +VDC.

The output on the MSP is designed to be used as either sink or source. The MSP contains a sinking gate and pull-up resistor. Source inputs can be wired directly to the MSP.

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. "0.?" may be any valid input. Note that the input resistance is different depending on the input used. This does not effect the MSP.

Note: The true/false sense for a sourcing input is opposite that of a sinking input. In ladder logic the hardware input into the driver must be negated to provide the proper logic sense.

Relay Outputs. Relay outputs can be used as either sink or source. We have used them only for source. See the next note on Sourcing outputs for a schematic and more details. The CPM1 has only mechanical relay outputs so I had to slow the output driver down in order to debug it and not destroy the relay. I used a scan time of 50 msec for the MSP analog output modules.

Output on Demand. In order to conserve the life of the relay output the output drivers contain some extra logic that allows control of when the output is transmitted. There are two bits for the user to access for this control.

The first bit "Out Demand Continuous" when turned on will cause the output to transmit continuously. When this bit is turned off the driver will complete the current transmission and then will remaining off. The continuous transmission bit has been forced on by ladder logic by default but may be edited if desired.

The second bit "Out Demand Single" causes the output to transmit one time. Only the off to on transition of this bit will cause a transmission. The continuous transmission bit takes priority over the single transmission bit. The continuous transmission bit must be turned off in order to use the single transmission bit. It is recommended that if the single transmission bit is use, the Delta Refresh Count Preset be set to zero (0). When the Delta Refresh Count Preset is set to zero (0) the full 16 bit value will be transited every time and the delta transmission is effectively turned off.

Input/Output Scan Time Ratio. For those drivers using both inputs and outputs there is logic that runs the output a factor of 5 times slower than the input. This allows the input to run at a scan time of 10 msec and the output to run a scan time of 50 msec. This is necessary only when relay outputs must be used.

Source Outputs. Each output is basically a transistor or gate with one end of each transistor tied to individual terminals. The other ends are tied together to a terminal that is usually labeled COM. This pull up transistor sources voltage and current from +VDC.

The input on the MSP is sink; it is basically a resistor tied to -VDC or common. Source outputs can be wired directly to the MSP.

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. "10.?" may be any valid output. In the single channel drivers the output is 10.00 but may be changed if desired. In the multiplexed drivers Channel 0 and 1 are 10.00 and 10.01 respectively but may be changed if desired.

Sink Outputs. Each output is basically a transistor or gate with one end of each transistor tied to individual terminals. The other ends are tied together to a terminal that is usually labeled COM VDC. This pull down transistor sinks voltage and current to COM VDC.

The input on the MSP is sink; it is basically a resistor tied to -VDC or common. Since both PLC output and MSP are sink a pull up resistor must be used. Sink outputs can be wired directly to the MSP with a pull-up resistor.

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. "O?" may be any valid output.

Note: The true/false sense for sinking outputs is opposite that of the sourcing outputs. In ladder logic the hardware output from the driver must be negated before going to the hardware output to provide the proper logic sense.

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