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
0 V
0 V
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
0 V
24 V
Valve switches to
fault mode
Pressurised
Pressurised
24 V
24 V
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
24 V
0 V
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
<
3 ms are ignored
–
MS6-SV-E pressurisation status
–
Test pulses
<
12 ms 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
