Siemens SIMATIC S5 Manual page 262

IP 266
Example 1:
The reference point is set:
The IP 266 services a job request in a controlled mode (e. g. mode 6). The status
data is returned in BCD format. All input data is valid.
The IP 266 returns the following in byte 2:
Byte Bit 7 Bit 6 Bit 5
2 0 0
Reference point is set
Machine data is OK
Job is in progress
EWA 4NEB 812 6057-02
Communication Between the CPU and the IP 266
Bit 4 Bit 3 Bit 2
0 0 1 0
Axis is not in position
Controller is on
Teach-In off
Bit 1 Bit 0
1 1
IP 266 is synchronized
BCD-coded data
7-17