User manual

Chapter 5: Installation and Wiring
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Hardware User Manual, 4th Edition, Rev. B
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System Wiring Strategies
The Productivity3000 system is very flexible and will work in many different wiring configurations. By
studying this section before actual installation, you can find the best wiring strategy for your application.
This will help to lower system cost and wiring errors, and avoid safety problems.
PAC Isolation Boundaries
PAC circuitry is divided into three main regions separated by isolation boundaries, shown in the
drawing below. Electrical isolation provides safety, so that a fault in one area does not damage
another. The transformer in the power supply provides magnetic isolation between the primary
and secondary sides. Optical isolators provide isolation in Input and Output circuits. This
isolates logic circuitry from the field side, where factory machinery connects. The discrete
inputs are isolated from the discrete outputs because each is isolated from the logic side.
Isolation boundaries protect the devices which are connected to the communication ports, such
as PCs and HMIs, from power input faults or field wiring faults. When wiring a PAC, it is
extremely important to avoid making external connections that connect logic side circuits to
any other.
CPU Module
Power Supply
Power
Input
PC, HMI, or other
communication devices
Output ModuleInput Module
Isolation Boundary
Logic Circuit
Com
Ports
Input
Circuit
Output
Circuit
Logic
Circuit
Logic
Circuit
Filter
Optional