Evaluating The Reference Signal (Job 9) - Siemens simatic et 200s Operating Instructions Manual

1PosUniversal/Digital
7.6 Functions of the 1PosU
7.6.14

Evaluating the Reference Signal (JOB 9)

Definition
The evaluate reference signal function is only available at incremental encoders and
non-active dosing operation.
By evaluating the reference signal you can synchronize the axis using an external reference
signal during a current run in inching or relative positioning mode. You can use either the
3 digital inputs or the zero mark as a reference signal.
You can assign parameters to the digital inputs DI0 (minus limit switch) and DI1 (plus limit
switch) and DI2 (reducing cam) as break or make contacts.
Supply the control interface with the reference point coordinates, and activate JOB 9. The
1PosU sets the feedback signal SYNC = 0.
If the 1PosInc/Digital detects the overrunning of the assigned parameter reference signal in
the referencing direction, the axis is synchronized. The 1PosU sets the feedback signal
SYNC = 1 and assigns the reference point coordinates to the actual value.
The referencing direction is determined by the reference signal and reference switch
parameters.
Reference signal:
Reference switch and
zero mark
Reference signal:
Reference switch
Reference signal: Zero
mark
Effect on the MODEs
MODE
Search for Reference
Inching
Absolute Positioning
Relative Positioning
352
Reference switch: Reference switch:
Reduction cam Reduction cam
towards minus towards plus
Minus referencing Plus referencing
direction direction
The referencing direction is not defined. The axis is synchronized at the next zero mark.
What Happens
The reference coordinates transferred with JOB 9 are valid
-
Run canceled with POS_ERR = 1 because SYNC is deleted
-
Reference switch: Reference switch:
Limit switch minus Limit switch plus
Plus referencing Minus referencing
direction direction
Operating Instructions, 05/2007, A5E00124871-04
ET 200S Positioning