OPERATING PROCEDURES
MODES OF OPERATION WHEN USING TYPE CTT TERMINAL
5 - 22
Error
When transferring to the execute mode, the Type SLC controller may
enter the
error
mode if a configuration error is detected. If this occurs,
refer to the
CTT Configuration and Tuning Terminal
instruction to
determine the cause of the error. Also refer to the status information
under
. The controller must then be placed into
configure
mode to correct the problem before placing the unit into
execute
mode. Depending on the configuration, the
error
mode may also be
entered from the
execute
mode by the occurrence of one of the fol-
lowing:
•
The trip block is activated.
•
A self-diagnostic failure occurs.
If either condition occurs, the Type SLC controller will enter the
bypass mode. The Type CTT terminal will, when addressing the con-
troller, report
VACANT
. Refer to Appendix D of the
for byte information.
1. Press
RESET
on the controller to receive the error message.
Refer to the
CTT Configuration and Tuning Terminal
instruction to
determine the cause of the error.
2. After the error has been corrected, place the Type SLC controller
into configure mode first and then into execute mode. As Figure
indicates, the execute mode is only accessible through the configure
mode.
When in the error mode, both analog outputs are in bypass mode and
the digital outputs are de-energized.
Figure 5-5. Entering the Execute Mode
TP80072A
ERROR
MODE
EXECUTE
MODE
CONFIGURE
MODE