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SR Controllers
Super Relay Controllers

(SR-22MRD shown with SR-HMI installed)

The SR family of controllers provide a wide range of analog, digital and high speed processing options.

The SR family of PLCs is UL508a compliant when used with Class II power. (Applicable to the DC units.) Slave UL508a compliant relays should be used when switching voltages greater than 48 Vdc.

The SR operator interface panel (HMI) provides for an alpha-numeric LCD screen to display and modify time, I/O status and counter/timer/analog values. Up to 64 user defined display screens are supported. Eight key inputs (4 function keys, 4 direction keys) allow operators to traverse menus and to enter and modify parameter values.

AC powered units provide AC digital inputs and Relay outputs.

DC powered units provide DC digital inputs and Relay or solid state outputs.

DC Powered units also allow a number of the inputs to be optionally treated as 0-10 Vdc analog inputs. Analog processing capabilities include the ability to compare analog values and to trigger digital events using preset analog thresholds. 

Optional interface units allow the connection of a  telephone interface, allowing remote call-up and control and local voice alarms, a remote control module allowing a hand held controller to affect controller functions and a Modbus communications module.


APB Controllers are programmed using a Function Block Programming language. The APBSoftware program development package provides an integrated programmer, debugger, simulator and real-time monitor in one convenient Windows based package at no cost.

Download SuperCAD software

Please refer to our PLC Support page for additional tools.

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