PLCs & Programmable Automation Controllers
PLC Automation Systems for Industrial Control
A programmable logic controller, or PLC, runs the control logic that sequences machinery, monitors sensors, and coordinates outputs across an automated process. A programmable automation controller, or PAC, extends that same role with added processing power and communication options for larger or more complex control systems.
Selecting the right controller depends on the number of inputs and outputs needed, the communication protocols the rest of the system uses, and how much processing headroom future expansion will require. These controllers are suitable for new machine builds, process automation projects, and replacement of discontinued controller models.
Shop Relevant carries PLCs and PACs along with the input and output modules used to build out a complete control system, supporting new automation projects and expansion or replacement work on existing panels. Same-day shipping available.
Frequently Asked Questions
What is the difference between a PLC and a PAC?
A PLC is generally built for dedicated, high reliability control of a specific machine or process, while a PAC offers greater processing power and more flexible communication for larger or more data intensive automation systems.
Can I replace an obsolete PLC with a current model?
In many cases a current controller can replace an obsolete one, though the control program typically needs to be migrated or rewritten for the new platform, and I/O modules may need to be matched or upgraded as well.
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Emerson IC694MDL645 Rx3i Discrete Input I/O Module, 24VDC 16-pointPart Number: IC694MDL645SKU: 39956
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Emerson IC694MDL730 Rx3i Discrete Output I/O Module, 12/24VDC 8-pointPart Number: IC694MDL730
SKU: 287489
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Emerson IC694ALG442 Rx3i Analog Mixed I/O Module, Current/Voltage 4 In / 2 Out-pointPart Number: IC694ALG442SKU: 244599
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Emerson IC695ALG808 Rx3i Analog Output I/O Module, Current/Voltage 8-pointPart Number: IC695ALG808SKU: 254568
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Emerson IC694ALG233 Rx3i Analog Input I/O Module, Current 16-pointPart Number: IC694ALG233
SKU: 39954
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Emerson IC694MDL230 Rx3i Discrete Input I/O Module, 120VAC 8-pointPart Number: IC694MDL230
SKU: 254532
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Emerson IC694MDL655 Rx3i Discrete Input I/O Module, 24VDC 32-pointPart Number: IC694MDL655
SKU: 254537
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Emerson IC694ALG220 Rx3i Analog Input I/O Module, Voltage 4-pointPart Number: IC694ALG220
SKU: 287476
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Emerson IC695HSC304 Rx3i Analog Input I/O Module, Highspeed Counter 4-pointPart Number: IC695HSC304SKU: 243404
