5. Use more than 2mm
2
cables for grounding. Place the earth point near the PLC as much as
possible to limit the length of grounding cable.
6. Separate Line Ground (LG) of power module and Frame Ground (FG) of base board for
grounding.
7. If a malfunction on grounding is detected, separate the FG of the base from the grounding.
3.1.4 Precautions for installing/handling the PLC modules
Take the following precautions while handling or installing modules.
l Do not drop the PLC module or apply excessive force on it.
l Do not touch the PCB inside the module with bare hands, as this can lead to failure of the PLC
Modules.
l Ensure that external materials, such as wiring fragments do not enter the upper part of module
casing. Even if such materials accidentally enter the module casing, remove them immediately.
Precautions for installing/handling I/O module
Note the following points while handling or installing the I/O module.
1. Recheck I/O module specifications
Check the input voltage for input modules. For output modules, check if the voltage applied exceeds the
maximum Open/Close capacity. Over voltage may lead to failure, damage, or sparking.
2. Cable selection
Select the appropriate cable after considering its capacity to withstand temperature and intensity of
current flowing through it. The minimum specification of cable must be AWG22 (0.3mm
2
).
3. Environment
When wiring an I/O module, ensure that it is not too close to any heat emitting equipment. In addition,
avoid the wires from coming in direct contact with oil, as it may cause a short circuit, breakage, or can
cause abnormal errors during operation.
4. Polarity
The polarity of the module terminals and that of the field signal must be the same.
- 28 -
Chapter 3 - Plan and Install MLPLC
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