1.3.4 Electric isolation of the modules
There are a group of 24V and a group 12V power supply built in the instrument and isolated to the main circuit. The
24V power commonly supplies voltage output module, such as V24/V12/V10, I2 and I4. The 12V power is commonly
supplies output or communication module. Generally, the relay contact output and TRIAC no contact discrete output
are self insulated from the other circuit, no matter whether other modules are installed or not. SSR voltage output do
not need to be insulated from input circuit, because SSR itself has isolation function. Therefore, only the electric
isolation between the communication interface and the current output should be considered. Those modules, for
example, S (RS485 communication interface), R (RS232 communication interface) and X3 (linear current output), all
need the 12V power supply. If more than one of the above modules are installed, in order to be electric isolated, only
one of them can be module without electric isolation, the other modules should be S4 or X4, which has its own
isolated power supply. For example, if an X module is installed in OUTP (main output) slot, and an S or X module is
installed in COMM (communication interface) slot, then OUTP and COMM can not be electric isolated, so S or X
should be replaced with S4 or X4.
1.3.5 Further descriptions about module applications
Voltage output module: The voltage output modules like V24, \/10 or V12 are often used for supplying power
for external transducer or feedback resistance of transmitter. These modules can be installed in any slot. To
standardize the wiring, it is recommended to be installed in the first idle slot in the order of MIO, AUX, and
CO M M.
No contact switch module : W1 and W2 are new types of no contact switch module which apply the advanced
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