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

User Manual
GFK-2949E
Note
4.1.3

I/O Scans

The EIS001 module for IEC 104 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 EIS001
Module.
STOP Mode
In Stop Mode, the IEC 104 Server will respond to General Interrogation requests. The
requests will be serviced with current state data; however, the data will be marked as non-
topical to the Client Station. In STOP Mode, write operations will return a failure to the Client
Station.
RUN IO Disable
In RUN IO Disable Mode, the IEC 104 Server will respond as documented for Stop Mode, but
the not topical flag will not be present on the data.
CRU Local Active OFF
In CRU Local Active OFF Mode, (where the client is connected to the IP of the module, not
the redundant IP) the IEC 104 Server will respond as documented for Stop Mode, but the
not topical flag will not be present on the data.
Note
CAUTION
There is no interlock between BIT or WORD functions of individual EIS001 modules. They
can reference the same memory space and can accept contrary commands from various
Client stations.
4.1.4

Alarms

The EIS001 generates faults which are logged into the Fault table. A given fault may relate
to the Ethernet interface, or may be specific to the IEC 104 Server functionality. Refer to
PACSystems RX7i & RX3i TCP/IP Ethernet Communications User Manual, GFK-2224 for a
description of ETM001-related alarms.
System Operation
: The Write Operations and ADSU will be processed by the active controller only. A Client
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 IEC 104 Client station. This is mainly due
to the way the Client and its host Operating system processes the change in end station
whenever the RX3i switches roles. The Client application, as well as the RX3i Controller
application must be developed to withstand a likely bump in the connection during a role
switch and not act inappropriately. This depends on the client tolerance and AUP File
parameters (wkal_idle, wkal_cnt, wkal_intvl) needs to be adjusted depending on the
network hops to get an optimized performance for role switch operation.
: Refer to Option Parameters for more details.
Chapter 4
Dec 2020
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