Function description
Operating Manual PSSu K F EI
1003303-EN-03
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4.5.4
Safe direction monitoring SDI-M
The "Safe Direction Monitoring" function (SDI-M) monitors the defined direction of move-
ment of the drive axis (positive or negative). The monitoring function SDI-M is not available
on sensors on which a position cannot be determined (Ini pnp-pnp, pnp-npn, npn-pnp,npn-
npn). The signals SDIM_PosEnable (SDIM_NegEnable) and SDIM_PosEnable_SS1M
(SDIM_NegEnable_SS1M) are constantly "0".
Activate the monitoring function by:
}
The monitoring function does not need to be activated. Monitoring starts as soon as the
module is ready for operation.
Reaction:
}
If the respective direction, plus the configured tolerance, is violated:
– a 1/0 pulse edge at SDIM_PosEnable or SDIM_NegEnable
– the local outputs switch off, depending on the configuration. Further information is
available in PAS4000's online help.
}
If the monitored direction of movement has been violated and the current position moves
in the right direction by more than the corresponding tolerance, SDIM_PosEnable
(SDIM_NegEnable) is automatically reset to "1".
}
If the monitored direction of movement has been violated and the current position cannot
be moved in the right direction by at least the corresponding tolerance, then the monitor-
ing function can be reset to "1" by a 0/1 pulse edge at SetSDIM.
Renewed adoption of the reference position or reactivation of the monitoring function:
}
0/1 pulse edge at SetSDIM
Monitoring of positive direction of movement:
t
s
0
1
Tol. pos
Tol. pos
SDIM_PosEnable/
SDIM_PosEnable_SS1M
SetSDIM
0
1
