Which products are affected?
ESP-SPAC-CAM1 – Cam V2.0 software package (library
LenzeCamControl1V0200.lib)
What does the response look like?
The position signal
dnPosOut_p of the function block
L_CamPosCtrlLin vibrates continuously around the target position
dnSet_p at the end of a positioning run. Since the target position is not statically reached, the status bit
bInTarget is not set.
When does the problem occur?
The problem only occurs sporadically. The problem occurs during both absolute and relative positioning modes (
L_CamPosCtrlLin.bPosMode = FALSE/TRUE).
Diagnostics options?
Despite the fact that positioning appears to be complete via the function block
L_CamPosCtrlLin, positioning is actually not completed. The status bit
bInTarget as a display of the completed positioning is not set.
Short-term measures/recommendations?
Only operate the function block in absolute positioning mode
(L_CamPosCtrlLin.bPosMode = FALSE). And do not use the status bit
L_CamPosCtrlLin.bInTarget. You can alternatively generate the message 'in target' via the function block interconnection shown below.
The second input on the LT function is a window. If the current position is located within the window around the desired target position, the message 'in target' is issued.
Evaluation:
The problem leads to a situation where the status message 'in target' is not set, despite the fact that positioning has been completed and the current position is just swaying slightly around the target position. Since the function block
L_CamPosCtrlLin is not used for axis positioning, but rather for ramp-controlled adjustment of offsets or mark correction, the vibration at the positioning input is generally not recorded under drive behaviour.
Instead of being defined via the function block output
L_CamPosCtrlLin.bInTarget, the status bit 'in target' can be formed simply using the program addition described in the
Short-term measures/recommendation section. The behaviour can also occur in the cam template if ramp-controlled mark correction/offset adjustment is selected.
