Operation Manual simco
®
drive
Revision: 11a 4022-D033499 en-47
日本語
10.8 Function description
Use of the STO safety function requires the inputs STO and STO GND to be connected to
the outputs of a safety control or safety relay that fulfills at least the requirements of PLd to
EN 13849-1 or SIL 2 to EN 61508.
Single-channel control SIL 2 / PLd:
With single-channel control of the STO safety function, the STO input is switched on by an
output of a safety relay. The STO GND is permanently connected to the GND of the safety
relay.
Two-channel control SIL 3 / PLe:
With two-channel control of the STO safety function, the STO and STO GND shutdowns
are switched separately by two outputs of a safety control. To achieve PLe or SIL3, the
outputs and lines must be monitored for short circuits by means of test signals from the
safety control.
• When wiring the STO inputs inside an installation space, make sure
that both the wiring used and the installation space itself meet the
requirements of EN 60204-1.
If the wiring is outside the installation space, it must be routed in a
permanent installation and protected from external damage.
• If the STO safety function is not required in an application, the STO
input must be permanently connected directly to +24 VDC and the
STO GND input must be permanently connected directly to GND.
The STO function is thus shunted out and cannot be used. The drive
amplifier is then no longer a safety component as defined by the
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