5
1.3 Modules
1.3.1 Slots of modules
AI-518 series instruments have five slots for modules to be installed (D dimension instruments have 3 slots:
OUTP, AUX and COMM/AL1; D2 dimension instruments have 2 slots: OUTP and COMM/AUX). By installing different
modules, the controller can meet the requirements of different functions and output types.
Multiple function Input/Output (MIO):
can input signal from 2-wire transmitter or 4-20mA signal by installing I4
(current input) module. If a I2 (on-off signal input) module is installed, the instrument can switch between
setpoints SV1 and SV2 by an external switch. Cooperating with OUTP and installing a K3 module can realize
three-phase thyristor zero cross triggering output.
Main output (OUTP):
is commonly used as control output such as on-off control, standard PID control, and AI
PID control. It can be also used as retransmission output of process value (PV) or setpoint (SV). Installing L1
or L4 modular can realize relay contact output; installing X3 or X5 module can realize 0-20mA/4-20mA/0-10mA
linear current output; installing G module can realize SSR voltage output; installing W1 or W2 module can
implement TRIAC no contact switch output.