7
D5037
- SIL 2 Switch/Proximity Detector Repeater Transistor Out
G.M. International ISM0270-3
Failure category
Failure rates (FIT)
λ
dd
= Total Dangerous Detected failures
0.00
λ
du
= Total Dangerous Undetected failures
27.48
λ
sd
= Total Safe Detected failures
0.00
λ
su
= Total Safe Undetected failures
92.76
λ
tot safe
= Total Failure Rate (Safety Function) =
λ
dd
+
λ
du
+
λ
sd
+
λ
su
120.24
MTBF (safety function, one channel) = (1 /
λ
tot safe
) + MTTR (8 hours)
949 years
λ
no effect
= “No Effect” failures
132.06
λ
not part
= “Not Part” failures
17.50
λ
tot device
= Total Failure Rate (Device) =
λ
tot safe
+
λ
no effect
+
λ
not part
269.80
MTBF (device, one channel) = (1 /
λ
tot device
) + MTTR (8 hours)
423 years
λ
sd
λ
su
λ
dd
λ
du
SFF
0.00 FIT
92.76 FIT
0.00 FIT
27.48 FIT
77.15%
T[Proof] = 1 year
T[Proof] = 8 years
PFDavg = 1.21 E-04 Valid for
SIL 2
PFDavg = 9.65 E-04 Valid for
SIL 2
PFDavg vs T[Proof] table
(assuming Proof Test coverage of 99%), with determination of SIL supposing module contributes >10% of total SIF dangerous failures:
PFDavg vs T[Proof] table
(assuming Proof Test coverage of 99%), with determination of SIL supposing module contributes
≤
10% of total SIF dangerous failures:
Failure rates table according to IEC 61508:2010 Ed.2 :
Failure rate table:
T[Proof] = 20 years
PFDavg = 2.41 E-03 Valid for
SIL 2
Systematic capability SIL 3.
Functional Safety Manual and Application
Application for D5037S
Description:
For this application, enable input line fault (open or short) detection and direct input to output transfer function, by set the internal dip-switches in the following mode (see page 10
for more information):
D5037S
(Ch.1)
OFF operation
ON operation
Field Input: proximity is OFF
or switch is open
Out 1 transistor is de-energized,
out is open
Channel 1
D5037S
(Ch.1)
Field Input: proximity is ON
or switch is closed
Out 1 transistor is energized,
out is closed
Channel 1
1
2
Out 1
1
2
Out 1
Safety
PLC
Input
Safety
PLC
Input
The module is powered by connecting 24 Vdc power supply to Pins 5 (+ positive) - 6 (- negative). The green LED is lit in presence of supply power.
Input signal from field is applied to Pins 7-8 (In 1 - Ch.1).
Transistor output Pins 1-2 (for Channel 1) is normally open (or transistor de-energized as safe state condition) for OFF operation, while it is closed (or transistor energized) for
ON operation.
The following table describes for Channel 1 the state (open or closed) of its output when its input signal is in OFF or ON state, and it gives information about turn-on or turn-off
of its channel status LED and channel fault LED:
Dip-switch position
1 2 3
4
ON/OFF state
ON
OFF Not used Not used
7
8
In 1
7
8
In 1
Supply
24 Vdc
5 +
6 -
Supply
24 Vdc
5 +
6 -
Input 1 signal state
Pins 7-8 (In 1 - Ch.1)
Transistor Out 1 state
Pins 1-2 (Out 1 - Ch.1)
Channel 1 status
yellow LED state
Channel 1 fault
red LED state
Proximity sensor is OFF or switch is open
Open (De-energize transistor)
OFF
OFF
Proximity sensor is ON or switch is closed
Closed (Energized transistor)
ON
OFF
Independently from proximity sensor or switch state, the input line is break
Open (De-energized transistor as safe state condition) OFF
ON
Independently from proximity sensor or switch state, the input line is in short circuit Open (De-energized transistor as safe state condition)
OFF
ON
Safety Function and Failure behavior:
D5037S is considered to be operating in Low Demand mode, as a Type A module, having Hardware Fault Tolerance (HFT) = 0.
The failure behavior is described from the following definitions :
□
Fail-Safe State: it is defined as the transistor output being open;
□
Fail Safe: failure mode that causes the module / (sub)system to go to the defined Fail-Safe state without a demand from the process;
□
Fail Dangerous: failure mode that does not respond to a demand from the process (i.e. being unable to go to the defined Fail-Safe state), so that the transistor output
remains closed;
□
Fail “No Effect”: failure mode of a component that plays a part in implementing the Safety Function but that is neither a safe failure nor a dangerous failure.
When calculating the SFF, this failure mode is not taken into account;
□
Fail “Not part”: failure mode of a component that is not part of the Safety Function but that is part of the circuit diagram and is listed for completeness.
When calculating the SFF, this failure mode is not taken into account.
Failure rate date: taken from Siemens Standard SN29500.
