Specifications

Positioning IP 240
Status of range bits BEE1, BEE2 and BEE3 during reference point approach
When reference point approach is selected, all three range bits (BEE1, BEE2 and BEE3) are set to
”1”.
Bit BEE1 is set to ”0” when the preliminary contact is reached. It remains at ”0” until the
preliminary contact is exited and the status area on the IP 240 has been read at least once. You can
control the switch to creep speed by evaluating status bit BEE1 ( Section 10.16).
Bit BEE2 is set to ”0” when the reference point is reached, and remains at ”0” until the reference
point approach is exited by transferring control bit HASY=0.
Interrupts during reference point approach
When you configure the channel, you can specify whether status bit BEE1 and/or BEE2 is/are to
have interrupt capability.
The following information is provided on interrupts:
BE1=1 The preliminary contact was reached and the speed must be switched to creep.
If the preliminary contact signal was already active at the start of reference point
approach, interrupt BE1 is generated immediately.
BE2=1 The reference point was reached.
Refer to Section 10.17 ”Reading the Interrupt Request Bytes” for information on how to read out
the interrupt bits from the IP 240.
Fig. 10-25. Range Bits BEE1 to 2 and Interrupt Bits BE1 to 2 during Reference Point Approach
1)
2)
Status bit
BEE1
Positive direction of travel
Interrupt bit
BE1
Status bit
BEE2
1) Is set to ”1” following reading of the status area
2) Is reset following reading of the interrupt request bytes
Status bit
SYNC
Z pulse
IN signal
Control bit
HASY
Interrupt bit
BE2
2)
Note
If the channel was structured for backlash compensation, the next Z signal from the
encoder following exiting of the preliminary contact signal in a negative direction
does not set status bit BEE2 to ”0” and does not trigger interrupt BE2.
10-44 EWA 4NEB 811 6120-02a