Modes Of Operation When Using Type Ctt Terminal; Execute; Configure; Modes Of Operation Comparison - ABB Command Series Instruction Manual

MODES OF OPERATION WHEN USING TYPE CTT TERMINAL

Execute

Configure

times-out or goes into an error mode. Pressing the reset button
causes the I/O to go through:
Fail state.
•
Power up state.
•
Start-up.
•
Execute.
•
When the reset button is pushed, the controller will go to bypass
mode for one or both loops and will display an alarm condition. This
bypass mode is indicated on the process display screens.
NOTE: This information applies only to users of a Type CTT Config-
uration and Tuning Terminal.
The Type SLC controller has three modes of operation when used
with a Type CTT terminal: execute, configure and error. The five
modes of operation indicated on the faceplate of a Type SLC control-
ler are automatic, manual, bypass, cascade and ratio. Table
shows how these modes compare to one another.
Table 5-6. Modes of Operation Comparison
Type SLC Controller
When using Type CTT
terminal
When Type CTT terminal is
not used (corresponding
mode on faceplate)
The execute mode is the normal mode of operation for the Type SLC
controller. The controller reads the configuration, monitors and
updates outputs, computes the algorithms, and performs self-diag-
nostic routines. The configuration cannot be changed, but parameters
may be tuned and block outputs can be monitored.
The configure mode is used to enter new configuration data, and
delete or modify an existing configuration. When bypass mode is
entered, the analog outputs are held at their present value, the digital
outputs are de-energized, and the algorithms are not computed. Exist-
ing parameters can be modified, blocks can be deleted or added, and
all parameters can be adjusted using the Type CTT Configuration and
Tuning Terminal.
MODES OF OPERATION WHEN USING TYPE CTT TERMINAL
OPERATING PROCEDURES
Modes of Operation
Execute Configuration Error
Manual Bypass
Auto Cascade
Ratio
5-6
Bypass
5 - 21