Machine Data and Incremental Dimensions
8-9
FM 351 Positioning Module
C79000-G7076-C351-02
Address Name Data
Type
Initial Value Description
100.0
104.0
108.0
112.0
CHGDIF_P
CHGDIF_M
CUTDIF_P
CUTDIF_M
DINT
DINT
DINT
DINT
L#5000
L#5000
L#2000
L#2000
Switchover difference plus
Switchover difference minus
Switch-off difference plus
Switch-off difference minus
Range:
• 1 m to 1 000 000 000 m at a
resolution of 1 m/pulse
• 1 m to 100 000 000 m at a
resolution of < 1 m/pulse
Switchover diff. plus/minus
Switch-off diff. plus/minus
The “switchover difference“ defines the switchover point at which the drive switches over from rapid to
creep speed.
The “switch-off difference” defines the switch-off point at which the drive is turned off (at creep speed).
From this point onwards, the FM 351 starts monitoring functions.
The values apply for all targets which the FM 351 approaches; with the exception of incremental
dimension 255.
Rules
• The values for the plus and the minus direction can be different.
• The switchover difference must be greater than the switch-off difference.
• The switchover difference must be within the working range.
• The switchover difference must be less than the end of the rotary axis.
• The switch-off difference must be greater than the half target range.
• The distance between the switchover point and the switch-off point must be selected so that the
drive can switch reliably from rapid to creep speed.
• The distance between the switch-off point and target must be selected so that the drive comes to a
stop within the target range.
• The distance between the switchover point, the switch-off point, and the start of the target range
must be equivalent to a time of at least 8 ms.
For more detailed information about the arrangement of the ranges, refer to Section 2.2.
Working
range
Target range
Stationary range
1 2 3
4 5
6
7
Target
0
1
2 3
4 5
6
7
8
9
9
8
8
9
Switch-off point
Switchover point
Software end limit switch
Software start limit switch
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