Honeywell Touchpoint Plus Safety Manual

5
Touchpoint Plus Safety Manual
3 Safety Function
Touchpoint Plus has two kinds of safety function: 1) Relay output and 2) 420 mA current output. The safety function must operate
as intended for SIL2 and here is the brief summary of intended opera-tion of each safety function.
1) Relay output
Status Description Intended operation
System fault relay
Normal
No fault in Touchpoint Plus and gas sensors connected
to Touchpoint Plus
Energized
Fault
Any troubles happened by internal diagnostic function
in Touchpoint Plus and the trouble from gas sensors
connected to Touchpoint Plus
De-energized
Channel relay
Normal
Channel relay is to monitor input gas sensor’s status. The
default channel relay setting is de-energized for normal
status. Customer has to configure channel relay setting
for input gas sensor’s fault, alarm, inhibit and warning
status
Energized or
De-energized
Fault
Alarm
Inhibit
Warning
2) 420 mA output
Status Description Intended operation*
Normal
The status of measuring the gas. 420mA analog current value has output by
measured gas value. The current output is a scaled 420mA output value where
4mA represents zero gas and 20mA represents full scale
4 – 20 mA
Inhibit
Warm-up, calibration and inhibit setting of Touchpoint Plus and gas sensor’s
inhibit situation. Gas measurement is stopped and 420mA output value is fixed
to the 2 mA.
2 mA
Over-range
The status that the measured gas value is over the over-range setting value.
420mA output value is fixed to the 3 mA.
3 mA
Under-range
The status that the measured gas value is under the under-range setting value.
420mA output value is fixed to the 3 mA.
3 mA
Fault
The case that the trouble is happened by internal Diagnostic function and gas
sensor’s fault. The gas measurement is stopped and 420mA output value is
fixed to 1 mA.
0 – 1 mA
* The mA value in the Intended operation is a default setting. It is highly recommend that user should NOT change the default setting
of mA value in each status
3 Safety Function

Honeywell Touchpoint Plus Specifications

General

Brand	Honeywell
Model	Touchpoint Plus
Category	Controller
Language	English