Glossary
IP244
C79000–Y8576–C858–02
9–4
Control byte
Eight-bit information unit to control channel functions, where
each bit is assigned to a different function.
Conversion time t
w
Corresponds to encoding time.
Correction profile
In cascaded control, the degree of influence of the master
controller on the secondary controllers can be selected by means
of an evaluation factor separately for each controller. This
produces a correction profile.
CPKL
Central processor ready (CPKL = 1 causes a reset).
CPU
Central processing unit
Cumulative setpoints
These are the setpoints actually effective in secondary control
loops (in cascaded control).
D
Derivative action of the controller.
Data block DB
Data list with values and parameters for the function block.
Disturbance response
Control reaction to a disturbance in the control system (e.g.
change of the load, increase of the through-put etc.). The
controller is assigned parameters to quickly compensate the
disturbances to achieve a uniform quality.
Dual-slope technique
Technique for analog-to-digital conversion. The measured
voltage is integrated over 20 ms or 16 2/3 ms followed by the
downward integration of a reference voltage to zero. The
measured voltage is proportional to the duration of the reference
integration.
Encoding time
Period of time between the start and end of an analog-to-digital
conversion.
EPROM
Program memory, contains the controller program of the IP 244;
can only be read from.
Error byte
Eight-bit information unit; each bit is assigned to a particular error
(1 = error).
Evaluation factor F
Determines the amount of influence of the master controller on a
certain subsequent controller (in cascaded controls).
Firmware
Operating program stored on the module in the EPROM.
Function block
Program module in the SIMATIC S5 programmable controller.
Group short circuit indication
Red LED, indicates when there is a short circuit at one of the
digital outputs.
Heating-cooling ratio
Ratio (parameter) to compensate for differences in heating and
cooling times with 3-step controllers to balance the adjustment
response.
High byte
More significant byte (DL) of a 16-bit data word (DW).
Hot channel control
Special control action for plastic injection molding machines.
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