Siemens SIMATIC CM35 Manual page 114

Switching the
digital outputs
(hardware
interrupt)
Start position
v
1
Digital output,
forwards 0
1
Digital output,
0
backwards
a) Approaching the setpoint
Figure 8-1 How the CM35 controls the direction of traversing
A positioning
sequence
CM35 Counter Module
(4) J31069-D0416-U001-A5-7618
The CM35 switches on the related direction output when a positioning proce-
dure starts. When the setpoint position is reached, the module switches off
the direction output again and triggers a hardware interrupt.
Setpoint position
Traversing direction
position in the forward direction
The positioning sequence is described below.
Þ Parameterize encoder resolution.
Þ Move axis to a position whose coordinate is known.
Þ Set actual value.
Þ Specify setpoint (in increments).
Þ Start axis with START command.
Ü Hardware interrupt indicates that setpoint position has been reached.
Ü Axis is switched off.
Þ STOP command concludes positioning of the axis.
Þ Specify new setpoint.
Þ Start axis with START command.
Ü Hardware interrupt shows that setpoint position has been reached.
Ü Axis is switched off.
Þ STOP command concludes positioning of the axis.
.
.
.
Þ
Symbols:
Ü
Positioning Operating mode
Setpoint position
Traversing direction
b) Approaching the setpoint
position in the backward direction
: Transferred to CM35 module
: Executed by the CM35 module
Start position
-v
8-3