9 LOADING AND INSTALLATION
(b)Do not connect the 24VDC outputs of two or more power supply modules in parallel to supply power to one I/O module. Parallel connection will damage the power supply modules.
24VDC
24VDC
Power supply | module |
Power supply | module |
I/O module | Power supply module |
| I/O module |
| |||
|
|
|
|
24VDC
External power supply
(c)100VAC, 200VAC and 24VDC wires should be twisted as dense as possible. Connect the modules with the shortest distance.
Also, to reduce the voltage drop to the minimum, use the thickest wires possible (maximum 2mm2).
(d)Do not bundle the 100VAC and 24VDC wires with, or run them close to, the main circuit (high voltage, large current) and I/O signal lines. Reserve a distance of at least 100 mm from adjacent wires.
(e)As a countermeasure to power surge due to lightening, connect a surge absorber for lightening as shown below.
AC | PLC |
| E2 |
E1 | Surge absorber for lightening |
POINT
(1)Separate the ground of the surge absorber for lightening (E1) from that of the PLC (E2).
(2)Select a surge absorber for lightening whose power supply voltage does no exceed the maximum allowable circuit voltage even at the time of maximum power supply voltage elevation.
9 - 24 | 9 - 24 |