Table of Contents
Advertisement
S5-100U
Prerequisites for a Synchronization
•
The reference signal
-
The sensor for the reference signal is connected to terminals 7 and 8 of the terminal block.
-
Synchronization is enabled with the leading edge (0 to 1) at terminal 8. If the signal was
already on "1" when the module was switched on, then the reference signal must be turned
off to restart the synchronization.
-
If the reference signal lies in the normal traversing range, the actual value will be constantly
resynchronized by the reference signal. To prevent the unwanted resynchronizing, you have
to mask out the reference signal after the first reference point approach.
•
The traversing direction after a positive edge of the reference signal
-
After the reference signal has been reached, the module has to recognize a positive
traversing path (up-counting) while the reference signal is still active (1). This means, you
have to input the reference signal with increasing actual value to synchronize the module.
•
The reference pulse
-
The reference pulse is generated by the position encoder at least once per revolution.
The first reference pulse that the module recognizes after a leading edge of the reference
signal synchronizes the module. This is also valid if, after the first positive traversing path,
the direction is changed and a reference pulse is encountered (see Figure 15-19). If, during
post synchronization, the reference point is again passed, then you have to mask out the
reference signal after the synchronization reference point approach to avoid resynchronizing
the module.
The following three figures illustrate different possibilities for a reference traversing path:
Reference
signal
Reference pulse
of the sensor
Sync bit
Figure 15-17. Position of the Reference Point (SYNC Bit=1) within the
Reference
signal
Reference pulse
of the sensor
Sync bit
Figure 15-18. Position of the Reference Point (SYNC Bit=1) after the Reference Signal
15-32
Positive direction of traverse
Reference Signal Range
Positive direction of traverse
Function Modules
EWA 4NEB 812 6120-02
Advertisement
Chapters
Table of Contents
