Operational principle of the multi-pin plug sockets NECA-…-MP1, -MP3 und -MP5
Status of
EN1
Status of
EN2
Status of valve
with NECA-…-
MP1
Status of valve
with NECA-…-
MP3
Status of valve with NECA-…-MP5
0V 0V Unpressurised Valve switches to
fault mode
Valve does not switch to fault mode,
but remains in the safe, unpressur-
ized status
Note:
Detection of shorts across contacts
and error detection and evaluation
necessary via external controller
0V 24V Valve switches to
fault mode
Pressurised Pressurised
24V 24V Pressurised Valve switches to
fault mode
Valve does not switch to fault mode,
but remains in the safe, unpressur-
ized status
Note:
Detection of shorts across contacts
and error detection and evaluation
necessary via external controller
24V 0V Valve switches to
fault mode
Unpressurised Unpressurised
Tab. 3 Operational principle of the multi-pin plug sockets NECA
Identification of signal transitions
If safety outputs with test pulses are used to control the product, the following runtime performance
must be observed:
– MS6-SV-E exhaust status
–
Test pulses < 3ms are ignored
– MS6-SV-E pressurisation status
–
Test pulses < 12ms are ignored
Detection of shorts across contacts of the enable signals
In general, detection of shorts across contacts is required to guarantee performance level e. Depend-
ing on the selected plug, either the product itself or the safety relay unit/PLC detects the cross circuit.
NECA-…-MP1 NECA-…-MP3 NECA-…-MP5
by safety relay unit/PLC (clocked sig-
nals)
by product by safety relay unit/PLC (potential dif-
ference monitoring)
Tab. 4 Detection of shorts across contacts
Product Overview
10 Festo — MS6-SV-...-E-10V24 — 2019-10d