Specifications
IP 240 Positioning
Transferring the distance values with the configuring FB
The distance values are initially transferred to the IP 240 when you configure the channel. Before
invoking FB 167, you must enter the distance values in the data block.
The distance value in data words 50 and 51 is for range BEE1,
the distance value in data words 52 and 53 for range BEE2,
and the distance value in data words 54 and 55 for range BEE3.
Permissible range of values:
• for a linear axis : 1 to 999,999
• for a rotary axis : 1 to 0.5·[final value for the rotary axis],
but not exceeding 999,999
0
2
19
2
11
2
3
0
2
18
2
10
2
2
0
2
17
2
9
2
1
0
2
16
2
8
2
0
Binary representation BCD representation
DL 50/52/54
DR
50/52/54
DL 51/53/55
DR
0
0
2
12
2
4
0
10
4
10
2
10
0
0
10
5
10
3
10
1
Bit
7 6 5 4 3 2 1 0
Bit
7 6 5 4 3 2 1 0
Data
byte
0
0
2
13
2
5
0
0
2
14
2
6
0
0
2
15
2
7
You can change the distance values after configuring by transferring new values.
Note
If you have chosen BCD representation for the position values and for the distance
values, the IP 240 carries out format conversions following transfer of these data.
These conversions on-load the firmware cycle. Note that this also affects the
response time of the other channel.
10.9 Monitoring Signal Acquisition (IMP)
In positioning mode, the IP 240 can monitor signal acquisition as follows:
Wirebreak/short-circuit in the encoder lines
Wirebreak/short-circuit monitoring is possible only for symmetrical incremental encoders.
Monitoring is activated automatically when you set switchbank S5 or S6 for symmetrical encoders
( Section 5.3.1). The IP monitors for wirebreak/short-circuit by comparing encoder pulse trains
A, B and Z with their inverse signals.
If an error is detected, the IP 240 sets status bit DRBR (wirebreak). This bit remains set on the IP
until the problem has been rectified and the DRBR bit has been read out at least once over the
status area or interrupt request bytes ( Section 10.17).
EWA 4NEB 811 6120-02a
10-33