Siemens SIMATIC S5 Manual page 248

IP 265
E Glossary
C
OM 265 language element
An elementary function in the IP 265 user program, such as logic operations, counters, timers,
comparators and the like.
C
ontrol bit
Informs the CPU application program that the IP 265 is working under COM 265 control and may not
be serviced by the CPU.
C
ontrol word
Data word via which the CPU application program acts upon the IP 265 user program. Via the control
word, the CPU can set the IP 265 to STOP or RUN. To make this possible, the CPU program must
set either the RUN bit or the STOP bit in the control word.
C
PU application program
Program which executes on an S5-100 CPU and which controls both the process and the IP 265 via
commands (STOP/RUN) and parameters.
D
ebouncing time
Delay required to match the high-speed 24 V inputs to simple sensors. A debouncing time of 1 to
2 ms can be configured with COM 265.
D
irect address
Fixed addresses for operands in the IP 265 user program with which the IP 265 interfaces are
referenced in the IP 265 user program.
D
irect identifier Direct address
F
PGA (Field Programmable Gate Array)
Electronic component of the IP 265 whose function is determined by the user with the aid of a
programming package. In contrast to microprocessors, an FPGA does not process program
sequences, but rather interconnects hardware structures. Components of this type are therefore
much faster than standard processors. The IP 265 is equipped with an FPGA whose functionality is
determined by the contents of a memory, thus enabling arbitrary reloading.
F
PGA clock pulse
Clock pulse with which the FPGA's inputs and outputs are read or written and the retentive COM 265
language elements are timed.
G
roup error bit
Bit in the IP 265 status word which the IP 265 sets each time an error is detected (e.g. command
error or load error). An error evaluation routine can be initiated by scanning the group error bit in the
CPU application program.
H
ard STOP
An IP 265 STOP state which can be exited only with a POWER OFF. The IP 265 is set to hard STOP
mode when it has been equipped with a faulty EPROM submodule, when the submodule is inserted
or removed during POWER ON, or when the module is defective.
I
dentifier Direct, symbolic address
EWA 4NEB 812 6130-02a
Glossary
E-1