Specifications

Positioning IP 240
Actual value range and overrange
The actual value range is defined as -9,999, 999 to +9,999,999.
Fig. 10-17. Actual Value Range and Overrange in Positioning Mode
0- 9,999,999 to - 1 0 - 9,999,999 to - 1 + 1 to 9,999,999 0 + 1 to 9,999,999
Overrange Defined actual value range Overrange
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.
Fig. 10-18. Evaluation of the Encoder Pulses
1st increment
Encoder pulse train A
Encoder pulse train B
2nd increm.1st increm.
Encoder pulse train A
Encoder pulse train B
Twofold resolution (AFL=2)
Increment
1st 2nd 3rd 4th
Encoder pulse train A
Encoder pulse train B
Fourfold resolution (AFL=4)
Single resolution (AFL=1)
10-24 EWA 4NEB 811 6120-02a