Mitsubishi Electric MELSEC iQ-R Series User Manual page 98

■Measures against back EMF
When connecting an inductive load, connect a diode in parallel with the load.
Use the diode that satisfies the following conditions:
• A reverse breakdown voltage is more than ten times as high as the circuit voltage.
• A forward current is more than twice as high as the load current.
Sink type
Inductive
OUT
load
COM
■About element protection of the output module
If excessive noise affects the terminals of the output module, the output may be turned on to help the protection of the output
element. Adjust the voltage between terminals of the output module to fall within the operating load voltage range by take
measures such as the following:
• To use an inductive load such as a relay, a surge suppressor is required on the load side as well. Take appropriate
measures with the measures against back EMF as a guide. ( Page 96 Measures against back EMF)
• To prevent excessive noise, avoid installing power cables together with I/O cables.
6 INSTALLATION AND WIRING
96
6.1 Before Using the I/O Modules
Source type
Inductive
OUT
load
COM