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channel system, including the MPCEs and the FSDs.
A single EDM input can be mapped to one or multiple Safety Outputs. This is accomplished by opening the Safety Output
Properties window and checking EDM, then adding External Device Monitoring from the Safety Input tab in the Add
Equipment window (accessed from the Equipment tab or Functional View tab), and connecting the External Device
Monitoring input to the EDM node of the Safety Output.
The EDM inputs can be configured as one-channel or two-channel monitoring. One-channel EDM inputs are used when the
OSSD outputs directly control the de-energizing of the MPCEs or external devices.
•
One-Channel Monitoring—A series connection of closed monitor contacts that are forced-guided (mechanically
linked) from each device controlled by the Safety Controller. The monitor contacts must be closed before the Safety
Controller outputs can be reset (either manual or automatic). After a reset is executed and the safety outputs turn
On, the status of the monitor contacts are no longer monitored and may change state. However, the monitor
contacts must be closed within 250 milliseconds of the safety outputs changing from On to Off. See
45.
•
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
milliseconds. See
Figure 28
•
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.
Safety Controller
MPCE1
Single-channel EDM used to monitor both MPCE
MPCE2
feedback signals. If one or both channels do not
close, the system enters a lockout mode.
Figure 26: One-channel EDM hookup
on p. 46.
+24V
dc
www.bernstein.eu
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Programmable Safety Controller SCR P
Safety Input
Device
EDM EDM
Safety Controller
RO1
MPCE 1
Dual-channel EDM used to monitor both
MPCE 2
MPCE feedback signals. If the channels are +24V dc
not in the same state, the system enters a
Lockout mode.
Figure 27: Two-channel EDM hookup
Figure 26
on p.
MPCE1
MPCE2
45
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