12.4 EDM1 (External Device Monitor)
12.4.1 Overview
The EDM1 (External Device Monitor) signal is used to monitor failures in the HWBB. Con-
nect the monitor signal as a feedback signal, e.g., to the Safety Unit.
To meet performance level e (PLe) in EN ISO 13849-1 and SIL3 in IEC
61508, the EDM1 signal must be monitored by the host controller. If the
EDM1 signal is not monitored by the host controller, the level will be
safety performance level c (Plc) and SIL1.
Safety Module Monitor (2410h)
You can also use Safety Module Monitor (2410h) to monitor the Safety
Module.
The relationship between the EDM1, /HWBB1, and /HWBB2 signals is shown below.
Detection of failures in the EDM1 signal circuit can be achieved by using the status of
the /HWBB1, /HWBB2, and EDM1 signals in the following table. A failure can be detected
by checking the failure status, e.g., when the power supply is turned ON.
Signal Logic
/HWBB1 ON ON OFF OFF
/HWBB2 ON OFF ON OFF
EDM1 OFF OFF OFF ON
WARNING!
The EDM1 signal is not a safety output. Use it only for monitoring for fail-
ures.
12.4.2 EDM1 Output Signal Specifications
If an HWBB is requested by turning OFF the two HWBB input signal channels (/HWBB1
and /HWBB2) when the safety function is operating normally, the EDM1 output signal will
be turned ON within 8 ms.
8 ms max.
/HWBB1
/HWBB2
/EDM1
OFF (motor current shut-OFF request)
ON
(normal operation)
OFF ON
Fig. 348: EDM1 Output Signal Specifications
Failure Detection Signal
for EDM1 Signal
Sigma-7 Series SERVOPACKs
Safety Functions
EDM1 (External Device Monitor) > EDM1 Output Signal Specifications
| | PROFINET Communications - SIEP YEUOC7P 02A Revision 0 | en | 474
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