Glossary - Siemens SIMATIC S5 Manual

Glossary

ADC
Approach manipulated
variable Y
AS
Approach setpoint W
A
Approach time T
AZ
Approach zone Z
A
Automatic operation
Backplane connector
Back-up
BASP
BCD coding
Cascaded control
Clock setting
Cold restart
Comparator
Compensation channel
Control algorithm
IP244
C79000–Y8576–C858–02
Analog-to-digital converter
Selectable value of manipulated variable with which a controller
influences the control system during the first start-up phase in
"Hot Channel Operation"
Setpoint which is controlled by a controller during approach time
T in "Hot Channel Operation".
AZ
Selectable period of time during which a controller controls the
approach setpoint W in "Hot Channel Operation".
A
The approach zone defines the control variable range (below the
approach setpoint) in which the controller controls the approach
setpoint.
The controller processes and calculates the manipulated
variable (control loop closed).
Connection to the device bus.
Battery back-up for RAM memory, supplied by the PLC.
Inhibit command output:
disables digital outputs if the monitoring indicates undervoltage in
the load voltage and/or power supply of the central controller.
Each four bits of a measured value represent a power of ten
(thousands, hundreds, tens and units).
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.
Power supply interference suppression
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.
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.
Measuring channel to connect a Pt 100 for the acquisition of the
reference junction temperature when the reference voltage is
exceeded.
Calculation program stored in the EPROM to simulate a PID
controller function.
Glossary
9–3