3
Z/T 235/236 AS
Z/T 256 AS
Operating instructions
Position switch with safety function
EN
2.5 Safety classification
Standards:
ISO 13849-1, IEC 61508
PL:
up to c
Control category:
up to 1
PFH:
1,14 x 10
-6
/ h up to max 100000 switching cycles/year
SIL:
up to 1
Service life:
20 years
If a fault exclusion of a hazardous damage to the 1-channel mechanics
is authorised and sufficient protection against tampering is ensured,
suitable up to:
PL:
up to d
Control category:
up to 3
PFH:
1,01 x 10
-7
/ h up to max 100000 switching cycles/year
SIL:
up to 2
Service life:
20 years
If multiple safety components are wired in series, the
Performance Level to ISO 13849-1 will be reduced due to the
restricted error detection under certain circumstances
3. Mounting
3.1 General mounting instructions
The mounting dimensions are mentioned at the rear of the enclosure
The fixing screws must be protected against unauthorised tampering
The enclosure must not be used as an end stop Any mounting position
To ensure a proper functioning, the switch must be installed so that
the required switch travel is obtained For safety functions, at least the
positive break travel indicated in the switch travel diagram (refer to
catalogue) must be obtained All components have sufficient after-
travel to compensate for inaccuracies in the guidance of the actuating
system The actuation of the switch beyond its end stop however must
be avoided
Please observe the relevant requirements of the standards
ISO 12100, ISO 14119 and ISO 14120
3.2 Dimensions
All measurements in mm
Z/T 235 AS
30
20
22
4.3
8.5
63.5
20
22
20
30
10
20
M12x1
22
FK
24
23
24
13.5
Z/T 236 AS
4.3
20
22
61.5
3
4
8.5
10
15.5
30
15
30
20
FK
24
23
24
M12x1
Z/T 256 AS
4.3
20
22
50
58
8.5
4
20
13.5
31
50.5
26
10
20
15.5
M12x1
FKL
24
23
24
4.3
20
22
50
58
8.5
4
20
13.5
31
50.5
26
10
20
15.5
M12x1
FKL
24
23
24
Actuator heads Z/T.. 235 / 236 / 256 AS
For selection and dimensions, see Schmersal catalogues and online
catalogue on the internet at wwwschmersalnet