Siemens SIMATIC S5 Manual page 250

IP 265
P
arameters
Data interchanged between the IP 265 user program and the CPU application program. The IP 265
user program can be supplied with parameters. The IP 265 supplies IP 265 user program-dependent
output parameters which can be postprocessed by the CPU application program.
An input parameter can be e.g. the preset value for a timer, an output parameter can be e.g. a count.
P
rogram scan time
Time which passes while the FPGA processes the program. For pure binary logic operations, the
program scan time is 1/128 kHz or 7.8 µs. Each retentive language element between an input and an
output in a segment increases the program scan time by 7.8 µs.
R
esponse time
Time between a signal state change at an input and setting of an IP 265 output. The response time is
a combination of the input delay, the output delay and the program scan time.
R
etentive language element
A COM 265 language element with a retention facility. Retentive IP 265 language elements include
timers, counters and all set/reset functions. A retentive language element lengthens the program
scan time by another 7.8 µs.
R
UN bit
Bit in the IP 265 control word. If it is set in the CPU application program, the IP 265 is set to RUN
after the next CPU data cycle.
S
egment
Smallest and only structural unit in an IP 265 user program. Inputs are connected to outputs in each
segment.
A segment comprises COM 265 language elements, connecting lines and operands.
S
tandard program
IP 265 user program which cannot be read out, modified or copied. A special standard function
counter can be obtained from your Siemens branch office, but you can define any self-written IP 265
user program as a standard program.
S
tatus word
Data word via which the CPU application program can read the status of the IP 265 program. The
status word provides status information as well as information on IP 265 errors/faults.
S
TOP bit
Bit in the IP 265 control word. If set in the CPU application program, the IP 265 is set to STOP after
the next CPU data cycle.
S
ymbolic address
Symbolic identifier for an operand in the IP 265 user program with which the IP 265 interfaces can be
referenced. It is assigned by the user, and may comprise no more than 24 characters.
S
ymbolic identifier Symbolic address
EWA 4NEB 812 6130-02a
Glossary
E-3