Glossary
9–3
IP244
C79000–Y8576–C858–02
Glossary
ADC
Analog-to-digital converter
Approach manipulated
Selectable value of manipulated variable with which a controller
variable Y
AS
influences the control system during the first start-up phase in
”Hot Channel Operation”
Approach setpoint W
A
Setpoint which is controlled by a controller during approach time
T
AZ
in ”Hot Channel Operation”.
Approach time T
AZ
Selectable period of time during which a controller controls the
approach setpoint W
A
in ”Hot Channel Operation”.
Approach zone Z
A
The approach zone defines the control variable range (below the
approach setpoint) in which the controller controls the approach
setpoint.
Automatic operation
The controller processes and calculates the manipulated
variable (control loop closed).
Backplane connector
Connection to the device bus.
Back-up
Battery back-up for RAM memory, supplied by the PLC.
BASP
Inhibit command output:
disables digital outputs if the monitoring indicates undervoltage in
the load voltage and/or power supply of the central controller.
BCD coding
Each four bits of a measured value represent a power of ten
(thousands, hundreds, tens and units).
Cascaded control
Connection of controllers in a cascade. The first controller
(master controller) either supplies a setpoint to the secondary
controllers or influences their setpoints depending on the
measured actual value.
Clock setting
Power supply interference suppression
Cold restart
Cold restart of the central controller following power failure. The
reaction of the programmable controller is programmed in
organization blocks OB 20, 21, 22. (See manual for the
programmable controller.)
In any case, all parameters are transmitted from the PLC to the
IP 244 after the module has been switched on.
Comparator
Device to compare the measured voltage at channel 13 with an
internally set reference and to initiate a signal when the reference
voltage is exceeded.
Compensation channel
Measuring channel to connect a Pt 100 for the acquisition of the
reference junction temperature when the reference voltage is
exceeded.
Control algorithm
Calculation program stored in the EPROM to simulate a PID
controller function.
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