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OPERATION
OPERATING MODES
I-E96-213A
5 - 3
OPERATING MODES
The MFC has four modes of operation: Execute, Configure,
Error and Diagnostic.
Execute Mode
The Execute Mode is the normal mode of operation. When the
MFC is in Execute, it computes algorithms, performs func-
tions, updates outputs, and communicates with the Module
and Slave Expander busses. While in this mode, certain user
configured function block parameters can be tuned (adjusted),
but no other changes can be made to a configuration. The Sta-
tus LED is solid green for normal operation. In certain nonfatal
error conditions, the LED flashes green but the MFC continues
to operate.
Configure Mode
The Configure Mode is used to enter or modify the user's con-
trol strategy. In this mode, function blocks can be added, mod-
ified, or deleted by using any of the standard INFI 90
configuration tools (MCS, OIS, CIU, CTT, CTM, Workstation).
When the MFC is in the Configure mode:
•
Slave analog outputs hold their current values.
•
Slave digital outputs are de-energized or hold last value
(refer to specific slave instructions for details).
•
Function algorithms are not computed.
•
The module responds only to CONFIGURE messages.
•
The Status LED blinks green.
Error Mode
The module enters the Error Mode when one of the following
occurs:
•
When a configuration error is detected in going from the
Configure to Execute mode.
•
After resetting due to a red light condition as a result of a
hardware problem (NVM or ROM checksum error).
•
When the MFC is unable to communicate with other mod-
ules (nonfatal).