Specifications
IP 240 Positioning
10.8 Position Data for Positions 1 to 254
Position data includes:
• the position value designating the absolute location of the position in the traversing range,
• the position number, which you use to select a position,
• the distance values of the switching and signalling ranges.
Position data for a total of 254 positions can be stored on the IP for each channel. The distance
values for the switching and signalling ranges apply to all positions.
Note
Position 0 is also available as additional position. Position 0 is not stored on the IP.
In contrast to positions 1 to 254, position 0 can be selected when the IP outputs for
the channel are set ( Section 10.14.2).
10.8.1 Position Value and Position Number
The position value defines the absolute location of the position in the traversing range. This value
refers to the zero point of the actual value range (actual value=0).
Permissible values for a position value:
• between - 9,999,999 and+9,999,999 for a linear axis
• between 0 and +[final value of the rotary axis - 1] for a rotary axis
Each position value is assigned a position number which you define during configuring. You can
select a position over the position number.
Permissible values for a position number: 1 to 254
So that there are no ambiguities in the allocation of position value to position number, each
position number may be defined only once. An error message is issued should you fail to observe
this rule.
Transferring position values and position numbers with the configuring FB
The position data is initially transferred to the IP 240 when you configure the channel. After
configuring, you can change the position values again. The inclusion of new position numbers or
the modification of old position numbers is not possible. Before invoking FB 167, you must enter
the position values, the position numbers and the number of positions to be transferred in the
data block.
The number of positions to be transferred must be entered in DW 58.
Permissible range of values: 0 to 254
0
2
3
0
2
2
0
2
1
0
2
0
Binary representation
DL 58
DR 58
0
2
4
Bit
7 6 5 4 3 2 1 0
Data
byte
0
2
5
0
2
6
0
2
7
EWA 4NEB 811 6120-02a
10-29