Crob Control Feature Configuration; Overview; Crob Control Dword Definition - Emerson PACSystems RX3i User Manual

User Manual
GFK-2911E
6.9

CROB Control Feature Configuration

Overview

This feature is provided to support different control codes like PULSE ON/OFF, CLOSE, TRIP
and LATCH ON/OFF for the CROB Control objects. This is implemented using additional
COMMREQ control words. These CROB control words provide a mechanism for passing on
the CROB control information like Control code, Control information etc. coming from the
DNP3 Master to the Controller Application logic, which can be used for generating desired
commands.

CROB Control Dword Definition

When the Outstation receives a CROB operate command from a Master station, the
associated Command parameters like Point number, Pulse duration time, Count and
Control type (PULSE_ON, PULSE_OFF, LATCH_ON, LATCH_OFF, TRIP and CLOSE) etc. are
updated in the appropriate CROB Control Dword (32-bit) (refer to Figure 15) and Trigger bit
is set. The Controller logic can then check the trigger bit and generate the required
command as per the Control Code.
For example, when the Pulse CROB command is issued by the Master station, then the
Outstation receives the command and updates CROB Control Dword with all command
parameters. The User logic can generate a Pulse command as per the trigger bit and pulse
duration parameters. The user logic needs to clear the trigger bit for any subsequent
operation.
Figure 15: CROB Control Dword Layout
The following are the parameters for the CROB Control Dword:
1. CROB Control Code
2. Trig Bit
Configuration of DNP3 outstation Parameters
This defines the control code for the CROB Control command as received by the
Outstation. The three bits are used to indicate the control code as shown in
15.
This is a read/write bit and is set by the Outstation in response to the CROB
command from the Master station. This can be reset by the user application to
indicate the consumption.
Chapter 6
Sep 2019
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