Festo Контроллер двигателя CMMD-AS - Manual (Page 78)

4. Functional safety engineering
78 Festo P.BE-CMMD-AS-HW-EN 1002NH
Among other issues, the EN 60204-1 standard deals with the handling of emergencies and
defines the terms EMERGENCY OFF and EMERGENCY STOP (see table).
Handling Definition (EN 60204-1) Danger case
EMERGENCY
OFF Electrical safety in case of emergency by
switching off the electrical energy to all or
part of the installation. EMERGENCY OFF is to be used where a risk
of electric shock or other electrical risk
exists.
EMERGENCY-
STOP Functional safety in an emergency by
bringing a machine or movable parts to
a standstill. EMERGENCY STOP is used to stop a process
or a motion if this creates a danger.
Table 4.1 EMERGENCY OFF and EMERGENCY STOP as per EN 60204-1
The standard EN 61800-5-2 describes various safety functions that can be used
dependent on the application.
For the position controllers of the CMMD-AS family, the STO and SS1 safety functions
have been implemented through external circuitry.
Galvanic isolation does not occur with the STO function. As a result, this does not have
any protective function against electric shock. In the sense of the standards, an
EMERGENCY-OFF system cannot be implemented with the STO, because this requires the
complete system to be switched off via a mains power isolator of some kind (main power
switch or mains circuit breaker).
Safety function as per
EN 61800-5-2 PILZ component Switch-off behaviour Stop category in
accordance with
EN 60204-1
STO Safe Torque Off PNOZ X2P
Relay outputs forced:
- 2 safety contacts no delay
Connection options for:
- EMERGENCY STOP buttons
- Protective door limit switches
- Start button
0
SS1 Safe Stop 1 PNOZ XV2P
Relay outputs forced:
- 2 safety contacts no delay
- 2 safety contacts relapse
delayed
Connection options identical
to X2P
Fixed or adjustable relapse delay
Cancelling the time delay through
Reset button
1
Table 4.2 Overview of the safety function in accordance with EN 61800-5-2