Honeywell Touchpoint Plus Safety Manual

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Touchpoint Plus Safety Manual
1 Overview
1 Overview
IEC 61508 is a generic functional safety standard. Functional safety is defined in IEC 61508 as “part of the overall safety relating
to the equipment under control (EUC) and the EUC control system which depends on the correct functioning of the E/E/PES
(Electrical/Electronic/Programmable Electronic Systems) safety related to systems, other technology safety-related systems,
and external risk re-duction facilities.
The basic operation principle and product descriptions are explained in the user manual of Touch-point Plus. Please refer to
Honeywell Analytics website: http://www.honeywellanalytics.com/en-gb/products/TouchpointPlus where Touchpoint Plus user
manual (part number: 3011M5001) is avail-able.
Touchpoint Plus has various outputs but only below two output signals are under SIL2 scope:
• Relay output
• 420 mA current output
Touchpoint Plus is SIL2 approved by SGS TUV SAAR (Certificate number: FS/71/220/17/0178) with the following safety
parameters in accordance with the combination of input board type (mA input, mV input and Dual input) and output function
(420 mA and Relay), Touchpoint Plus’s detail PDF and PFH can be summarized as followings:
1) Touchpoint Basic Unit
Input Safety Function SFF PDF
avg
PFH
mA Input
420 mA > 90% 5.73 X 10
4
1.22 X 10
7
Relay > 90% 5.73 X 10
4
1.21 X 10
7
mV Input
420 mA > 90% 9.48 X 10
4
2.03 X 10
7
Relay > 90% 9.48 X 10
4
2.03 X 10
7
Dual Input
420 mA > 90% 7.98 X 10
4
1.70 X 10
7
Relay > 90% 7.98 X 10
4
1.69 X 10
7
2) Touchpoint Expansion Unit
Input Safety Function SFF PDF
avg
PFH
mA Input
420 mA > 90% 6.02 X 10
4
1.27 X 10
7
Relay > 90% 6.01 X 10
4
1.26 X 10
7
mV Input
420 mA > 90% 9.77 X 10
4
2.08 X 10
7
Relay > 90% 9.76 X 10
4
2.07 X 10
7
Dual Input
420 mA > 90% 8.27 X 10
4
1.74 X 10
7
Relay > 90% 8.26 X 10
4
1.73 X 10
7
where,
SFF: Safe Failure Fraction. A percentage of safe failures as compared to all failures
PFD
avg
: Average probability of failure to perform its design function on demand (1-year normalized value)
PFH: Probability of a dangerous failure per hour

Honeywell Touchpoint Plus Specifications

General

Brand	Honeywell
Model	Touchpoint Plus
Category	Controller
Language	English