Manual switching amplifier BS 805
Page 6 of 12
Subject to technical change 10/2017
A.S.T. Angewandte SYSTEM-TECHNIK GmbH Dresden
5.2. Example
6. Information on Performance-Level PLc in accordance with DIN EN 13849-1
6.1. Classification of Type Series “Switching Amplifier BS 805”
The Switching Amplifier BS805 can be classified in the Performance-Level PLc in accordance with the set of
standards governing Safety Relevant Control Systems DIN EN 13849-1.
This then covers hazards as shown in the hazard graphs below recommended for safety-relevant control systems in
conjunction with the Performance-Level PLc and SK1 Category.
Severity of injury
(S)
S1 Slight injury (usually temporary)
S2 Severe injury (usually irreversible),
including death
Frequency and/or duration of exposure to
hazard
(F)
F1 ... Seldom to quite often and/or short
duration of exposure
F2 ... Frequent to permanent and/or short
duration of exposure
Possibility of preventing the hazard (
P)
P1 ... Possible under certain conditions
P2 ... Hardly possible
6.2. Error detection in operation with a connected sensor
The Switching Amplifier BS805 identifies the following errors:
Sensor monitoring
-
Wire breakage, also on single core of sensor cable.
-
Short circuit on any number of cores of sensor cable.
-
“Unsafe” connection of individual cores.
Internal monitoring
-
Failure of operating voltage
-
Failure of sensor power supply
The BS 805 is responding to an error with:
-
Relay SP1 and SP2 fall (to drop out)
-
LED U78 blinking
-
Output signal is 2mA
sequence
Operation for Code 341
LED-display
1.
3-times
press >T1<
>U2-U4-U8<
light
2.
Wait approx. 2 sec
Light off
3.
4-times
press >T1<
>U2-U4-U8-U16< light
4.
Wait approx. 2 sec
Light off
5.
1-times
press>T1<
>U2< light
6.
end
LED >U16< flashing approx. 2 sec
S
1
Starting
point for
assessing
risk
reduction
Low
risk
Required
performance
level PL
High
risk
a
b
c
d
e
F
1
P
1
P
1
P
1
P
1
F
1
S
2
F
2
P
2
P
2
P
2
P
2
F
2
