3
SRB 201ZH
Operating instructions
Safety-monitoring module
EN
2.5 Safety classification
Standards:
EN ISO 13849-1, IEC 61508,
EN 60947-5-1, DIN EN 574, EN 60204-1
PL:
up to e
Control category:
up to 4
DC:
99% (high)
CCF:
> 65 points
PFH value:
≤ 2,00 × 10
-8
/
h
SIL:
up to 3
Service life:
20 years
The PFH value of 2.00 × 10
-8
/h applies to the combinations of contact
load (current through enabling contacts) and number of switching cyc-
les (nop/y) mentioned in the table below At 365 operating days per year
and a 24-hours operation, this results in the below-mentioned switching
cycle times (t
cycle
) for the relay contacts
Diverging applications upon request
Contact load
n
op/y
t
cycle
20 %
525,600
10 min
40 %
210,240
25 min
60 %
75,087
70 min
80 %
30,918
170 min
100 %
12,223
430 min
3. Mounting
3.1 General mounting instructions
Mounting: snaps onto standard DIN rails to EN 60715
Snap the bottom of the enclosure slightly tilted forwards in the DIN rail
and push up until it latches in position
3.2 Dimensions
All measurements in mm
Device dimensions (H/W/D): 100 x 225 x 121 mm
with plugged-in terminals: 120 × 22.5 × 121 mm
4. Electrical connection
4.1 General information for electrical connection
The electrical connection may only be carried out by
authorised personnel in a de-energised condition
As far as the electrical safety is concerned, the protection
against unintentional contact of the connected and therefore
electrically interconnected apparatus and the insulation of the
feed cables must be designed for the highest voltage, which
can occur in the device
Wiring examples: see appendix
5. Operating principle and settings
5.1 LED functions
K1: Status channel 1
K2: Status channel 2
5.2 Description of the terminals
Voltages:
A1
A11
A2
A21
+24 VDC
+ 24 V
0 VDC
0 V
Inputs:
S11
S12
S21
S22
Input channel 1 (+)
Input channel 1 (−)
Input channel 2 (−)
Input channel 2 (+)
Outputs:
13 - 14
23 - 24
31 - 32
First safety enabling circuit
Second safety enabling circuit
Auxiliary NC contact as signalling contact
Start:
X1 - X2
Feedback circuit
K1
K2
SRB
201ZH
A1 23 13
X1 S12 S11
X2 S22 S21
A2 24 14
31
A1.1
A2.1
32
Fig. 1
5.3 Notes
Signalling outputs must not be used in safety circuits
The NC contact of the buttons A + B must be opened, before
the NO contact closes No overlapping contacts to avoid
triggering of the fuses F1 and F2
The pushbuttons A + B must be actuated within a timeframe
of ≤ 0.5 sec (simultaneous operation monitoring), otherwise
no start enabling signal is given!
