3
03.96
3.3 Connection of a 2nd MCP/customer OPI and/or 1 HHU (up to SW 3.1)
3-50
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SINUMERIK 840D Installation and Start-Up Guide (IAD) – 04.00 Edition
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
GD identifiers as314//CPU1:: bhg//CPU1::
SR 1.1 4 1
GD 1.1.1
»mb0:20
mb0:20
SR 1.2 1 4
GD 1.2.1 mb20:6
»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
GD identifiers as314//CPU1:: bhg//CPU1::
GST
GDS 1.1
SR 1.1 4 1
GD 1.1.1
»mb0:20
mb0:20
GDS 1.2
SR 1.2 1 4
GD 1.2.1 mb20:6
»mb20:6
You now need to specify the status double words for GDS1.2.
Extract from table 1:
table 1
GD identifiers as314//CPU1:: bhg//CPU1::
GDS 1.2 md26
Once you have entered the status, you must compile your configuration again.
Changing the SR
parameters
Activate status
3 Settin
s, MPI / OPI
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