Horner-apg XL7 OCS User Manual download pdf (Page 43)

XL7 User Manual

The analog inputs have a digital filter that can be used to filter electrical noise that may be unavoidable

in some installations. The downside to digital filtering is the inputs will respond more slowly to sudden

changes in the actual input.

10.7.1 Common cause of analog input tranzorb failure, Models 2,3 & 4

If a 4-20mA circuit is initially wired with loop power but without a load, the analog input could see 24Vdc. This is

higher than the rating of the tranzorb.

This can be solved by not connecting loop power prior to load connection or by installing a low-cost PTC in series

between the load and the analog input.

Figure 10.7 – Analog input tranzorb - troubleshooting

10.8 Universal Analog Inputs

Note: See the data sheet for the XL7 OCS model being used for jumper settings and see the appropriate

pages in this manual (see Index

) for details on how to use Cscape to configure the digital filtering.

The universal analog inputs provide a high resolution, very flexible interface for a variety of analog

inputs. These inputs include voltage, current, thermocouple, RTD and millivolt. Each channel can be

configured separately using jumpers and configuration settings in Cscape.

Like the standard analog inputs, these inputs have a digital filter that can be used to filter electrical noise

that may be unavoidable in some installations. The downside to digital filtering is the inputs will

respond more slowly to sudden changes in the actual input.

10.9 Analog Outputs

Note: Refer to the datasheet for XL7 OCS model being used for details on jumper settings.

The analog outputs on XL7 OCS devices provide high resolution voltage or current outputs. The voltage

or current selection is controlled with jumpers and configuration settings in Cscape. Note that each

channel can be separately configured for voltage or current mode.

When the controller is stopped the operation of each output is configurable. The outputs can hold the

state they were in before the controller stopped or they can go to a predetermined value. By default

analog outputs are set to a value of zero. For more information on Stop State, refer to the appropriate

pages (see Index

) for the configuration chapter for Cscape settings.

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Horner-apg XL7 OCS User Manual Page 43