3.3
Parameters of the Safety Function SFM
The following parameters are achieved within the scope of the SFM function according
to EN 61508-1:2010 to EN 61508-7:2010 (German versions):
▶
system 1oo2
▶
SFF > 90 %
▶
PFH = 1.07 × 10
−9
1/h
▶
PFD = 4.75 × 10
−6
▶
SIL 3 (corresponds to PLe in EN ISO 13849-1)
▶
reaction time: typical value < 150 ms, max. value = 2000 ms
3.4
Transmission of the Status Message
The status of the SFM function can be transmitted via two outputs (as 2-channel OSSD
signal) and via fieldbus.
3.4.1
Status Message via OSSD Signal
The drive amplifier SD2 provides the standstill status at connector X66 for a safety
PLC (connector pin assignment see
).
The safety PLC sends a 2-channel OSSD signal to the drive. This signal passes
through the signal chain of the safety function in the drive. Then, the signal is read
back by the PLC and checked for integrity.
The drive closes the signal circuit as soon as the status STANDSTILL is reached.
Thereby, the drive adds monitoring pulses to the OSSD signal which must be filtered
by the PLC. These monitoring pulses are used to check the hardware components. If
any faulty behavior occurs, the signal circuit is immediately opened.
In the status NO_STANDSTILL the circuit is open, i.e. the PLC cannot read its OSSD
signal back.
Fig. 3: Status Transmission via OSSD Signal
If several drives should be evaluated, a signal chain can be created (see
). You
can connect up to 16 drives (or 8 double-axis drives) in one signal chain.
Safe Frequency Monitor (SFM)
W
14
Drive System SD2 - Safety Functions SFM / SLOF
3
Содержание SD2
Страница 1: ...Drive System SD2 Safety Functions SFM SLOF P TD 0000426 12 2019 08 28 SIEB MEYER W ...
Страница 4: ...Chapter Overview W 4 Drive System SD2 Safety Functions SFM SLOF ...
Страница 10: ...General Information W 10 Drive System SD2 Safety Functions SFM SLOF 2 ...
Страница 16: ...Safe Frequency Monitor SFM W 16 Drive System SD2 Safety Functions SFM SLOF 3 ...
Страница 44: ...Fieldbus Communication W 44 Drive System SD2 Safety Functions SFM SLOF 6 ...
Страница 56: ...OSSD Signals W 56 Drive System SD2 Safety Functions SFM SLOF 8 ...
Страница 66: ...Error Messages W 66 Drive System SD2 Safety Functions SFM SLOF 10 ...