INTRODUCTION
I-E96-211A
A - 1
APPENDIX A - ON-LINE CONFIGURATION
INTRODUCTION
This section provides a basic procedure for on-line configura-
tion, and shows both the state of LEDs 7 and 8 as well as the
contents of the second module status byte (specifically bits 7,
6, 3 and 1). On-line configuration, used with redundant
Multi-Function Controllers (MFC), enables you to make config-
uration changes without affecting the primary MFC or inter-
rupting the control process.
In redundant MFC configurations, the primary MFC executes
the process control logic while the backup MFC tracks the con-
figuration of the primary. On-line configuration allows the user
to remove the backup MFC from the tracking mode and make
configuration changes, without interrupting the process con-
trol operation of the primary MFC. Normal off-line changes are
supported by on-line configuration. When the backup MFC is
reconfigured, it can assume control with the new configuration
while the original primary MFC takes the backup role.
During start-up of the new configuration in the backup MFC,
the present values of all process outputs in the primary MFC
are used. This feature permits bumpless transfer of control to
the new configuration.
SETUP
On-line configuration of redundant MFCs requires two consec-
utive module bus addresses to be reserved. In normal opera-
tion each member of the redundant pair has the same module
bus address. (If the module bus address of the redundant pair
is at 4 during normal operation, then automatically the module
bus address of the backup MFC is at 5 during on-line
configuration).
Set Switch 2 on Dipswitch SW4 (see Figure
in Section 3) of
the backup and the primary MFC to the open position. Doing
so enables the use of on-line configuration.
OPERATION
The following procedure shows how to perform on-line configu-
ration. These standard INFI 90 configuration tools can be used
to do on-line configuration: Configuration and Tuning Module
(CTM), Configuration Tuning Terminal (CTT), Operator Inter-
face Station (OIS), Management Command System (MCS), and
