Virtual Inputs And Outputs; Output Matrix - Allen-Bradley 857 Quick Start Manual

Chapter 3 Local Panel User Interface
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Table 13 - Digital Input Threshold Voltages
The digital input signals can be used for blocking and control signals for the
output relays. An additional input card is available as an option. The additional
option card is located in the X8 location and has the same ratings as the card in
X7.
Common Input group
input
X7:7 X7: 1...6 (DI 7...12)
X7:14 X7: 8...13 (DI 13...18)

Virtual Inputs and Outputs

There are four virtual inputs and six virtual outputs. The four virtual inputs act
like normal digital inputs. The state of the virtual input can be changed
through any communication bus and from SetPointPS. These virtual inputs are
used through the communication port or within any on board programmed
logic program. They can be used for applications such as status monitoring for
remote starting or as a process interlock or for status reporting. They can be
mapped in both the Output Matrix and the Blocking Matrix within the
Protection System.
The six virtual outputs act like output relays. There are no physical contacts
unless the virtual output is linked in an Alarm or Trip relay contact by way of
the Output Matrix. Virtual outputs are shown in the output matrix and the
block matrix. Virtual outputs can be used through the communication port or
within any on board programmed logic program. They can be used for
applications such as initiating the functions for remote starting or for the
initiating of process controls when mapped to an output relay. They can be
mapped in both the Output Matrix and the Blocking Matrix within the
Protection System.

Output Matrix

The output matrix connects, the output signals of the various protection stages,
digital inputs, and logic outputs to various digital output relays or status
indicators. The output matrix can also connect other internal signals to the
output relays, front-panel status indicators, virtual outputs, and so on.
There are two status indicators named "Alarm" and "Trip" on the front panel
that is mapped within the Output Matrix. There are also three general-purpose
status indicators – "A", "B" and "C" – available for customer-specific
indications. In addition, the triggering of the disturbance recorder (DR) and
virtual outputs are configurable in the output matrix. See an example in
Figure 9.
Rockwell Automation Publication 857-QS001B-EN-P - April 2017
Wetting-voltage
On Off
≥ 18V DC or ≥ 50V AC ≤ 10V DC or ≤ 5V AC
≥ 18V DC or ≥ 50V AC ≤ 10 Vdc or ≤ 5V AC