Siemens S7-300 - 10.2 Set Actual Value;Set Actual Value On-The-Fly;Cancel Set Actual Value

Settings
10.2 Set Actual Value/Set Actual Value on-the-fly/Cancel Set Actual Value
FM 352 electronic cam controller
104 Operating Instructions, 05/2011, A5E01071724-03
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
new
- ACT
current
Whereby:
● ACT
new
is the default value
● ACT
current
is the actual value at the time of execution
Determining new coordinates
Calculate all your default positions in the shifted coordinate system based on the following
formula:
Coordinate
new
= Coordinate
old
+ (ACT
new
- ACT
current
)
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
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
new
- ACT
current
) must be less than or
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
2. Set the appropriate trigger bits at the channel DB.
3. Call the FB CAM_CTRL.
"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.