Supplying Power To The External I/O Circuit; Indicators - Thermo Scientific Prima PRO User Manual

Local I/O
Discrete I/O
Discrete I/O
Supplying Power
to the External
I/O Circuit

Indicators

D-4 Prima PRO & Sentinel PRO Mass Spectrometers User Guide
This provides digital and (as an option) analogue connectivity for a
wide variety of functions.
Table D–2. Discrete I/O
I/O Type Function
Digital output Instrument fail*
Digital output Alarms, status etc
Digital input Control functions
4-20 mA or 0-10 V
Analogue I/O
Inputs and / or
(option)
outputs
*
"Instrument fail" will go into the alarm state if any hardware alarm is on or if the
processor watchdog is in the failed state.
If the required quantity of I/O exceeds that listed above, an external
I/O unit may be used. This is documented elsewhere.
All I/O is provided with full isolation (at least 1kV) between the
instrument and the user connection points.
Digital output channels can be configured as voltage free contact or
24 Vdc output. Similarly, digital inputs can be configured to require
either an external voltage free contact or an external 24 ±4 Vdc.
Configuration is by means of jumpers on the I/O CPU board. Fitting
the jumper labelled VF makes the input or output voltage free,
requiring an external supply. Fitting the two jumpers labelled V
gives internally powered 24 V operation. Each channel is
individually configured (powered or non-powered channels can be
mixed).
Note that outputs are fused at 1 A. For internally powered outputs,
the total current available from the onboard 24 V supply can be
between 0.65 and 2.0 A depending on which other I/O options are
present and making demands on the 24 V supply. This is shared
between the active output channels. Consult the factory if more detail
is required, or use an external power supply.
All digital channels have an associated LED showing the state of the
output or input. When an output channel is driven on, the LED is on
and the output contact is closed. When an input is energized (24 V
applied), the LED and the input channel are on. Note that the logic of
each I/O channel (positive or negative) can be readily changed in the
software configuration, but the LED will always indicate the state of
the input or output circuit.
Number of I/O Channels
1
12
13 (12 for Ex systems)
16 (8  2-channel modules,
module types can be mixed)
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