Siemens SIMATIC S5 Manual page 261

Communication Between the CPU and the IP 266
Bit 3 = 1 The controller is on. This bit is always set when the position controller
is on.
= 0 This bit is set to "0" in modes 3 and 4.
Bit 4 = 1 The IP 266 is in Teach-In mode. This bit is set when you select mode 10
(Teach-In mode).
= 0 This bit is reset to "0" when the Teach-In mode is terminated by
invoking mode 11.
Note:
When mode 10 is aborted because of an "error in the position control loop",
the IP 266 enters mode 4. When mode 4 is terminated with the Stop command,
the Teach-In mode must also be terminated by invoking mode 11.
Bit 5 = 1 No reference point has been set. Target positions may be specified or
a machining program invoked only when a reference point has been
set. An error is flagged if you attempt to execute an operation that
requires a reference point.
= 0 The reference point is set.
Bit 6 = 1 Valid machine data is not available. You can start a mode only when
the IP 266 has been correctly initialized, i. e. when valid machine data
is available.
= 0 Valid machine data is available on the IP 266.
Bit 7 = 1 This bit is set when a job has executed.
In modes 8 and 9, it is set only when the relevant mode has terminated.
It is not set after single machining operations.
= 0 The job is in progress.
7-16
IP 266
EWA 4NEB 812 6057-02