WBPEEUI240766B0 A - 1
Appendix A
NTAI06 Termination Unit
Introduction
The IMASI13 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 tempera-
ture is used to compensate for the cold junction effect on
thermocouple 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
temperature around the terminal blocks and the RTD. Main-
taining both at the same temperature allows maximum accu-
racy 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 Function Code Application Manual
Function Code Application ManualFunction Code Application Manual
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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