Siemens SIMATIC S5 Manual page 258

IP 266
Table 7-8. Overview of the Input Frame
Byte
0 Current mode
1 M function
2 Bit 7 Bit 6
0/1 0/1
Status bits for axis, controller and machine data
3 Current IP 266 error codes
Bytes 4 to 7 are used for actual position, distance to go or following error,
depending on the specified mode and on the current monitoring command.
4 Binary:
5 16-bit fixed-point number with sign (bit 7 in byte 4) used to forward the
integer positions of the value to the IP 266.
BCD:
Byte 4, bits 4 to 7: sign of the BCD number
Byte 4, bits 0 to 3 and
Byte 5, bits 0 to 7: 3 BCD digits
6 Binary:
7 16-bit binary number used to forward the decimal positions to the IP 266.
BCD:
Byte 6, bits 4 to 7: least-significant integer position
Byte 6, bits 0 to 3 and
Byte 7, bits 0 to 7: three decimal positions
EWA 4NEB 812 6057-02
Communication Between the CPU and the IP 266
Description
Bit 5 Bit 4 Bit 3
0/1 0/1 0/1
Recommen-
Bit 2 Bit 1 Bit 0
0/1 0/1 0/1
ded data
format
KF
KF
KM
KH
KF
KH
KF
KH
7-13