Siemens SINUMERIK FM-NC Installation And Startup Manual page 63

08.97
03.96
Setting the
Click the View / Reduction ratio softkeys. The following table 1 with the SR
parameters appears:
reduction ratio
SR 1.1
GD 1.1.1
SR 1.2
GD 1.2.1
SR 2.1
GD 2.1.1
SR 2.2
GD 2.2.1
Changing the SR The transmission rate for the HPU must be set.
parameters The default setting is one transmission that takes place every 8 PLC cycles.
With a PLC cycle time of 25 ms, the default then corresponds to a key scan of
200 ms. This may be too slow for some applications. To reduce the transmis-
sion rate change the "reduction ratio", i.e. the SR parameters.
You must specify a value of 1, 2, 4 or 8. Only 4 and 8 are allowed for transmis-
sion. The transmission to and from the HPU is then activated at a correspond-
ing frequency (e.g. every 4th PLC cycle).
Example of table 1 with altered SR parameters:
SR 1.1
GD 1.1.1
SR 1.2
GD 1.2.1
SR 2.1
GD 2.1.1
SR 2.2
GD 2.2.1
When you have changed the SR parameters, you must compile your configura-
tion again.
 Siemens AG 2000 All Rights Reserved
SINUMERIK 840D Installation and Start-Up Guide (IAD) – 04.00 Edition
GD identifiers as314/CPU1::
8
»
qb0:8
8
ib0:8
8
»
qb16:8
8
ib16:8
GD identifiers as314/CPU1::
4
»
qb0:8
1
ib0:8
4
»
qb16:8
1
ib16:8
3 Settings, MPI / OPI
3.5 Handheld programming unit
table 1
MCP/CPU1:: HPU/CPU1::
8
qb0:8
8
»
ib0:8
8
qb16:8
8
»
ib16:8
table 1
MCP/CPU1:: HPU/CPU1::
1
qb0:8
4
»
ib0:8
1
qb16:8
4
»
ib16:8
3
3-63