Programming manual SCU-series
HB-37500-820-10-12F-EN SCU Programming manual
Page 202 of 252
Status: 19.03.2021
SDI (Safe Direction of Increment)
Recognition of the direction
Amount:
cf.
“Overview of the safety modules”
Function:
monitoring of the given rotational direction / the given motion direction
Input:
standardised position signal / speed signal X from encoder inferface.
Direction flag LEFT / RIGHT.
Reset-Function:
Violation of the permitted monitoring range is saved and requires a RESET
confirmation. RESET confirmation is alternatively carried out via:
•
RESET function in the group Input elements.
•
Function button at the front side of a basis group
•
Fieldbus input via Reset block.
NOTICE:
It must be programme-technically ensured that the inputs of the SDI block do not
remain on 1 in the event of a trigger. Otherwise, the SDI block could not be reset
any more.
If the function is activated, it must be programme-technically ensured that at no time
CW and CCW become 1 at the same time because otherwise an alarm is emitted.
Example
:
Cf. SLI function.
Functional description
•
Monitoring of the given rotational direction / the given motion direction
•
Calculation the the current rotational direction RX from the position signal / speed signall X
Output function:
Range
HI
LO
V < 0
AND
DIRECTION FLAG = LEFT
X
V >= 0
AND
DIRECTION FLAG = RIGHT
X
V < 0
AND
DIRECTION FLAG = RIGHT
X
V > 0
AND
DIRECTION FLAG = LEFT
X