9-32
ET 200U Distributed I/O Station
EWA 4NEB 812 6087–02b
Table 9-3
Pulse Evaluation
Single
Evaluation
Double
Evaluation
Quadruple
Evaluation
Counting
Pulse
A
Counting Pulse
B
Count
0
1
0
1
2
0 1 2 3 4
A rotary incremental position encoder produces 1000 pulses per revolution.
The spindle has a pitch of 50 mm/revolution. The position encoder therefore
produces 1000 pulses for a traversing path of 50 mm (1 revolution).
The resolution of the encoder is therefore 50 mm/1000 pulses.
The counter can handle up to 65,536 pulses. With the above resolution, the
traversing ranges shown in Table 9-4 are obtained.
Table 9-4
Sample Traverse Range
Pulse
Evaluation
Single
Double
Quadruple
Traversing
Range
3.25 m
1.625 m
0.81 m
Distance
Travel-
led/ Pulse
50
m
m
25
m
m
12.5
m
m
Loading Setpoints
In the STEP 5 program, two setpoints can be transferred to the module. These
setpoints must lie between – 32768 and +32767.
The acceptance of the setpoints by the module depends on whether the “set-
point 1 (setpoint 2) reached” bit has been set in the diagnostics byte.
If the bit is not set, which means the existing setpoint is not reached or not
exceeded, the new setpoint is immediately accepted and is immediately
valid.
If the bit is set, which means the existing setpoint is reached or exceeded, the
new setpoint is not valid until a positive edge occurs at the enable input.
If you do not specify a setpoint, a setpoint of 0 applies.
Example
Function Modules