contacts must be closed within 250 milliseconds of the safety outputs changing from On to Off. See
page 55.
• Two-Channel Monitoring—An independent connection of closed monitor contacts that are forced-guided
(mechanically linked) from each device controlled by the Safety Controller. Both EDM inputs must be closed before
the Safety Controller can be reset and the OSSDs can turn On. While the OSSDs are On, the inputs may change
state (either both open, or both closed). A lockout occurs if the inputs remain in opposite states for more than 250
• No Monitoring (default)—If no monitoring is desired, do not enable the Safety Output EDM node. If the Safety
Controller does not use the EDM function in Category 3 or Category 4 applications, the user must make sure that
any single failure or accumulation of failures of the external devices does not result in a hazardous condition and
that a successive machine cycle is prevented.
CAUTION: EDM Configuration
If the application does not require the EDM function, it is the user’s responsibility to ensure that this does
not create a hazardous situation.
CAUTION: External Device Monitoring Connection
Wire at least one normally closed, forced-guided monitoring contact of each MPCE or external device to
monitor the state of the MPCEs (as shown). If this is done, proper operation of the MPCEs will be
verified. Use MPCE monitoring contacts to maintain control reliability.
+24V dc
MPCE 1
R/SO1
MPCE1
Safety Input
Device
EDM
Safety Controller
MPCE 2
MPCE2
Single-channel EDM used to monitor both MPCE
feedback signals. If one or both channels do not
close, the system enters a lockout mode.
Figure 34. One-channel EDM hookup
+24V dc
MPCE 1
R/SO1
MPCE1
Safety Input
Device
EDM EDM
Safety Controller
MPCE 2
MPCE2
Dual-channel EDM used to monitor both
MPCE feedback signals. If the channels are
not in the same state, the system enters a
Lockout mode.
Figure 35. Two-channel EDM hookup
XS/SC26-2 and SC10-2 Safety Controllers
54
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