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Positioning
Actual value range and overrange
The actual value range is defined as -9,999, 999 to +9,999,999.
-
9,999,999
to
- 1 0
Overrange
Fig. 10-17. Actual Value Range and Overrange in Positioning Mode
When the defined actual value range is exited, the counter enters the overrange and the IP 240
sets the UEBL bit. In the overrange, pulse acquisition (counting) proceeds as in the defined actual
value range.
Since synchronization of the actual value is lost when the counter enters the overrange,
•
synchonization bit SYNC is reset,
•
comparison of the actual value with the switching and signalling ranges is stopped,
•
the outputs are disabled,
•
range bits BEE1 to 3 and direction bit RICH are set to "1"
•
and the selected position is declared invalid.
Status bit UEBL can trigger an interrupt if you initialized the PRA2 parameter accordingly when
you configured the channel ( Section 10.10). The associated interrupt bit (UEB) is reset in the
interrupt request bytes.
Status bit UEBL is reset on the IP when the status area was read once with UEBL=1 or when the
interrupt request bytes were read and it was the overrange that triggered the interrupt.
10.7.1 Resolution (AFL)
During configuring, you can specify an increment multiplication to match the resolution (travel
per increment) to the traversing range. Accuracy can be increased by a twofold or fourfold
increase in the resolution. The available traversing range (maximum path) is thereby reduced by a
factor of 2 or 4. Each increment decrements or increments the actual value by one.
Single resolution
Encoder pulse train
Encoder pulse train
Twofold resolution (AFL=2)
Encoder pulse train
Encoder pulse train
Fourfold resolution (AFL=4)
Encoder pulse train
Encoder pulse train
10-24
-
9,999,999
to
Defined actual value range
(AFL=1)
A
B
A
B
A
B
Fig. 10-18. Evaluation of the Encoder Pulses
- 1
0
+ 1 to 9,999,999
1st increment
1st increm.
2nd increm.
1st
2nd
3rd
IP 240
0 + 1 to 9,999,999
Overrange
Increment
4th
EWA 4NEB 811 6120-02a
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