ABB PU517 Channel isolation module

To determine compatibility with a specific proximity switch, find the ON state characteristics of the switch in the following diagram. If that point falls to the left of the input load line, the ON state characteristics are compatible. As an example, the ON state requirements of a compatible proximity switch of 3mA at 5 volts drop are shown below. OFF state compatibility is assured if the proximity switch leakage is less than 3mA with a module input voltage of 5 volts or less.

This module can be configured to have either a 1 ms or 10 ms input filter. Configuration is on a module, not per point basis; all points have the same filter time. See the PLC Reference Manual for detailed information.

Interrupt Input

 If the CPU supports input interrupts, input point A1 may be configured to cause an interrupt. Configuration allows the CPU to be interrupted on either the rising or falling edge of the signal transition. Interrupt response is not affected by input filter time selection. Refer to the PLC Reference Manual for detailed information.

Module Keying 

Earlier versions of this module included a mechanical key to prevent inadvertently replacing a module with another of the wrong type. The key latched onto the backplane center rail when the module was first installed, and remained on the backplane if the module was removed. A new module without this keying feature can be installed in a previously-keyed slot without removing the earlier keying. However, the key is easily removed by pushing it upward to unhook the latch while pulling it off the rail.

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