10.2 Set Actual Value/Set Actual Value On-The-Fly/Cancel Set Actual Value - Siemens S7-300 Operating Instructions Manual

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10.2 Set Actual Value/Set Actual Value on-the-fly/Cancel Set Actual Value

10.2 Set Actual Value/Set Actual Value on-the-fly/Cancel Set Actual
Value
Definition
You program the "Set actual value/Set actual value on-the-fly" settings in order to assign a
new coordinate to the actual encoder value. This shifts the coordinate system by the value:
ACT
Whereby:
● ACT
● ACT
Determining new coordinates
Calculate all your default positions in the shifted coordinate system based on the following
formula:
Coordinate
Requirements
● The axis must be synchronized.
● With "set actual value on-the-fly": Digital input I1 must be interconnected.
Programming steps
1. Enter the coordinate for the actual value, or for the actual value to set on-the-fly in the
2. Set the appropriate trigger bits at the channel DB.
3. Call the FB CAM_CTRL.
104
- ACT
new current
is the default value
new
is the actual value at the time of execution
current
= Coordinate
new
channel DB.
– Linear axis:
Select an actual value so that the software limit switches are still within the permissible
traversing range after the setting is called.
The absolute value of the offset derived from (ACT
equal to the absolute value of the permitted traversing range (maximum 100 m or
1000 m).
– Rotary axis:
Rule for the defined actual value:
0 ≤ actual value < end of rotary axis
"Set actual values" is executed immediately.
"Set actual value on-the-fly" is executed at the next positive edge at digital input I1. The
FVAL_DONE bit is set.
+ (ACT - ACT
old new current
)
- ACT ) must be less than or
new current
FM 352 electronic cam controller
Operating Instructions, 05/2011, A5E01071724-03