Safe stop input (ss_in), Safe limited speed input (sls_in), Door monitor input (dm_in) – Rockwell Automation 21G PowerFlex 750-Series AC Drives Reference Manual User Manual
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Rockwell Automation Publication 750-RM001F-EN-P - February 2012
Chapter 4
Speed Monitoring I/O Signals
Safe Stop Input (SS_In)
The SS_In input is intended for connection to an E-Stop device.
The SS_In input must be active to initiate Safe Stop monitoring. If the SS_In
input is being monitored, a transition from ON to OFF (closed to open) is used
to request the configured Safe Stop Type.
In a cascaded configuration, the SS_In inputs of the middle and last drives are
connected to the Safe Stop (SS_Out) output of an upstream safety option.
Safe Limited Speed Input (SLS_In)
The SLS_In input is used to connect to a switch whose OFF state requests Safe
Limited Speed monitoring.
If Safe Limited Speed monitoring is configured, the SLS_In input is monitored
from the time of a successful Safe Stop Reset or Safe Limited Speed Reset, until
the time that the configured Safe Stop Type is initiated or the Safe State is
entered.
If the SLS_In input is being monitored, the OFF state is used to request the Safe
Limited Speed monitoring functionality of the safety option.
In a cascaded configuration, the SLS_In inputs of the middle and last drives are
connected to the Safe Limited Speed (SLS_Out) output of an upstream safety
option.
Door Monitor Input (DM_In)
This input monitors the status of the door to indicate if it is open or closed. The
DM_In input can be connected to a non-guardlocking switch if the door does
not need to be locked. The door status is monitored by the first unit in multi-axis
systems.
The DM_In input is intended for connection to a guardlocking switch when the
safety option is configured as a master device with door monitoring. When the
safety option is configured as a slave in a cascaded system, its DM_In input is
connected to the Door Control output (DC_Out) of the upstream safety option.
for more information.