Wiring: Allen-Bradley

Wiring: Allen-Bradley

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. This type of input is available only on the MicroLogix. We have used them only for sink. See the next note on Sinking inputs for a schematic and more details.

Note: MicroLogix DC Inputs are Sink/Source

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 "DC 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. "I?" may be any valid input. In the single channel drivers for the MicroLogix the input is I:0/9 but may be changed if desired. In the multiplexed drivers for the MicroLogix Channel 0 and 1 are I:0/8 and I:0/9 respectively but may be changed if desired.

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 +24 VDC. 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. "I?" may be any valid input.

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.

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 +24VDC. 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. "O?" may be any valid output. In the single channel drivers for the MicroLogix the output is O:/5 but may be changed if desired. In the multiplexed drivers for the MicroLogix Channel 0 and 1 are O:0/4 and O:0/5 respectively but may be changed if desired.

Note: MicroLogix outputs are source.

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.

SensorPulse Corp. • P.O. Box 8886 • Michigan City, IN 46361 • Ph: (800) 447-5900 or (219) 393-7218 • Fax: (219) 393-7318