Mitsubishi MELESEC-ST User Manual page 42

3 SYSTEM CONFIGURATION
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(d) Multiple I/O modules and intelligent function modules cannot be replaced at
a time.
Change the I/O modules and intelligent function modules one by one.
POINT
Only I/O modules and intelligent function modules can be replaced online.
Power distribution modules and base modules cannot be replaced online.
Before replacing the power distribution module or base module, be sure to shut off
all phases of the external power supply.
Failure to do so may damage all products of the MELSEC-ST system.
(8) Precautions for use of intelligent function modules
The system should be configured as described below when the intelligent
function modules (ST1AD - , ST1DA - , ST1TD , ST1RD , ST1SS ) are
used together with the I/O modules (ST1X -DE1, ST1Y -T ) and contact
output modules (ST1Y -R ).
If the intelligent function modules are used without the following precautions
being observed, the accuracy of the intelligent function modules may not be
satisfied.
(a) Separate 24VDC power supply (AUX. input) for each kind of the following
slice modules
For the I/O modules or intelligent function modules, separate the 24VDC
power supply (AUX. input) using another power distribution module
(ST1P D).
For details, refer to the system configuration example Fig. 3.2, Fig. 3.3, Fig.
3.5 or Fig. 3.6.
<Separation category>
Intelligent function module
ST1AD - , ST1DA - , ST1TD , ST1RD , ST1SS
Contact output module
ST1Y -R
I/O module (excluding contact output module)
ST1X -DE1, ST1Y -T , ST1Y -R
When modules will not be replaced online, contact output modules
and I/O modules can be set in the same section.
(b) Noise filter connection
Connect a noise filter to the 24VDC power supply (AUX. input) of the power
distribution module (for intelligent function module distribution).
For details, refer to the system configuration example Fig. 3.2 or Fig. 3.3.
A noise filter need not be connected when the 24VDC power supply (AUX.
input) is separated using another external AUX. power supply.
For details, refer to the system configuration example Fig. 3.5 or Fig. 3.6.
The following noise filters are recommended.
Recommended products
Noise filter Model
Maker
Voltage
Rated output
Current
MXB-1210-33 MXB-1230-33
LAMBDA
250VAC, 250VDC
10A 30A
MELSEC-ST
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