WBPEEUI240774A0 A - 1
Appendix A
NTAI06 Termination Unit
Introduction
The IMASI23 module (ASI) uses one NTAI06 termination unit
for termination. Jumpers on the termination unit configure
each of the 16 analog inputs for either system powered 4 to 20
milliamperes, external powered 4 to 20 milliamperes,
three-wire RTD, differential voltage, or single ended voltage.
NTAI06 termination units with both revision A and revision B
hardware are in service. This section contains information on
revision A and B units (refer to Figure A-1 and A-2).
Cold Junction Reference Input
Each NTAI06 termination unit has a pair of RTDs which mea-
sure the temperature of the termination unit. This temperature
is used to compensate for the cold junction effect on thermo-
couple inputs.
When using the built-in cold junction reference, the termina-
tion unit covers should be in place. The cover encloses both the
terminal blocks and the RTD. It helps maintain the same tem-
perature around the terminal blocks and the RTD. Maintaining
both at the same temperature allows maximum accuracy for
thermocouple inputs.
To apply the built-in cold junction reference for thermocouple
inputs, refer to function code 215 specifications and block out-
puts in the Composer Function Code Application Manual
Composer Function Code Application ManualComposer Function Code Application Manual
Composer Function Code Application Manual.
Configuring Inputs
Jumpers on the termination unit configure the 16 analog
inputs. Table A-1 lists the inputs that the NTAI06 unit accepts.
Table A-2 lists the jumper configurations for the NTAI06 unit.
Table A-3 describes the NTAI06 input types.
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