Toshiba Vm Series Instruction Manual page 92

Chapter 7 Troubleshooting
External cause check
If a controller abnormality occurs as follows, you may need to suspect external factors:
 If the failure occurs in synchronization with operation of I/O equipment:
 If the failure occurs in synchronization with operation of peripheral motor or high-
 If the abnormality occurs in synchronization with operation of the machine:
 If a similar trouble recurs after replacement of the troubled module:
74
6F8C1645
The failure may be due to noise that occurs when the output equipment is turned ON
and OFF. Take measures against noise according to the caution for application of I/O
modules.
frequency equipment:
The failure may be due to influence of noise induced through the I/O signal line.
Alternatively, it may be due to power supply surge or fluctuation in voltage or ground
potential, depending on the ground system. Read the precautions described in the
installation/wiring, section in this manual, again. In some cases, you can try on
removed the ground aspect as one of the methods.
The abnormality might be due to influence of vibration. Check the unit and module
installation conditions. Also, consider vibration-proof measures such as use of
vibration-proof rubber.
Thoroughly check whether the module contains scrap metal or a water droplet that
may drop.
In addition to the above cases, for example, stable operation of the system will not be
guaranteed if the ambient temperature exceeds the range required in the
specification. Pay close attention to the environmental conditions.