Siemens SINUMERIK FM-NC Installation And Startup Manual page 50

3 Settings, MPI / OPI
3.3 Connection of a 2nd MCP/customer OPI and/or 1 HHU (up to SW 3.1)
Changing the SR
parameters
GD identifiers
SR 1.1
GD 1.1.1
SR 1.2
GD 1.2.1
Activate status
GD identifiers
GST
GDS 1.1
SR 1.1
GD 1.1.1
GDS 1.2
SR 1.2
GD 1.2.1
GD identifiers
GDS 1.2
3-50
The transmission rate for the HHU must be set.
The default setting is one transmission 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 change the transmission rate, the "Reduc-
tion ratio", i.e. the SR parameters, need to be changed.
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 HHU is then activated at a correspond-
ing frequency (e.g. every 4th PLC cycle). Example of table 1 with altered SR
parameters:
table 1
as314//CPU1::
4
»
mb0:20
1
mb20:6
When you have changed the SR parameters, you must compile your configura-
tion again.
Click the View / Status menu. Table 1 below is then displayed.
table 1
as314//CPU1::
4
»
mb0:20
1
mb20:6
You now need to specify the status double words for GDS1.2.
Extract from table 1:
table 1
as314//CPU1::
md26
Once you have entered the status, you must compile your configuration again.
SINUMERIK 840D Installation and Start-Up Guide (IAD) – 04.00 Edition
bhg//CPU1::
1
mb0:20
4
»
mb20:6
bhg//CPU1::
1
mb0:20
4
»
mb20:6
bhg//CPU1::
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03.96