I/O Scans; Alarms - Emerson PACSystems RX3i User Manual

User Manual
GFK-2911E
Note:

I/O Scans

The EDS001 module for DNP3 data exchange does not use a specific I/O Scan Set as defined
in the PAC Machine Edition processor Settings tab, and in the Ethernet tab for the EDS001
Module (Figure 9).
STOP Mode
In STOP Mode, the DNP3 Outstation will respond to Class 0, 1, 2, or 3 poll requests. The
requests will be serviced with current state data; however, the data will be marked as offline
to the Master Station. In STOP Mode, CROB and Analog Output Values will return a failure
to the Master Station.
RUN IO Disable
In RUN IO Disable Mode, the DNP3 Outstation will respond as documented for STOP Mode,
but the offline flag will not be present on the data.
CRU Local Active OFF
In CRU Local Active OFF Mode, the DNP3 Outstation will respond as documented for STOP
Mode, but the offline flag will not be present on the data.
CAUTION
There is no interlock between CROB functions of individual EDS001 modules. They can
reference the same memory space and can accept contrary commands from various master
stations.

Alarms

The EDS001 generates faults which are logged into the Fault table. A given fault may relate
to the Ethernet interface, or may be specific to the DNP3 Outstation functionality. Refer to
PACSystems RX7i & RX3i TCP/IP Ethernet Communications User Manual, GFK-2224 for a
description of Ethernet-related alarms.
System Operation
1. It is recommended to add the following TCP Keep Alive parameters in AUP File, for
effective changeover of DNP3 communication to Redundant IP:
i. (wkal_idle = 1,wkal_cnt = 1,wkal_intvl = 4)
2. The CROB function and Analog Output Value will be processed by the active controller
only.
3. A Master connected to an RX3i CRU system that uses Redundant IP can experience a
bump, or loss of communication in the event of a role switch at the DNP3 master station.
This is mainly due to the way the Master and its host Operating system processes the
change in end station whenever the RX3i switches roles. Your master application, as well
as the RX3i PLC application must be developed to withstand a likely bump in the
connection during a role switch and not act inappropriately.
Also refer to CRU Local Active OFF below.
Chapter 4
Sep 2019
22