Position Of The Reference Point (Sync Bit=1) After The Reference Signal - Siemens SIMATIC S5 ET 200U Manual

Function Modules
Figures 9-17, 9-18, and 9-19 illustrate different possibilities for a reference
traversing path.
Figure 9-17 Position of the Reference Point (SYNC Bit 0=1) within the Reference Signal
Figure 9-18 Position of the Reference Point (SYNC Bit=1) after the Reference Signal
Figure 9-19 Position of the Reference Point (SYNC Bit=1) during a Reversal of
9-34
Reference
Signal
Reference
Pulse of
the Sensor
Sync
Bit
Range
Reference
Signal
Reference
Pulse of
the Sensor
Sync
Bit
(1) First reference pulse detected by the module after the
leading edge of the reference signal
Reference
Signal
Reference
Pulse of
the Sensor
Change of Direction
Reference
Signal
(1)
Reference
Pulse of
the Sensor
Sync
Bit
(1) First reference pulse detected by the module after the
leading edge of the reference signal
Direction before Reaching the Reference Pulse in a Positive Direction
Positive Direction of Traverse
(1)
Positive Direction of Traverse
ET 200U Distributed I/O Station
EWA 4NEB 812 6087–02b