Toshiba T2N - Manual (Page 92)

6.Troubleshooting
User’s manual 77
When a problem occurs in the system, having first thoroughly understood the
content of the problem, it is important to determine whether the cause lies on
the mechanical side or on the control system (PLC) side.
Also, the cause of one problem frequently gives rise to secondary problems.
Therefore it is important clearly to determine the cause of the problem by
considering the system as a whole.
When the problem is considered to be in the T2N itself or in the input/ output of
the T2E, first check the following items.
Is the power supply
module “POWER” LED
lit?
Is the CPU module
“RUN ” LED lit?
Does the problem appear
to be in operation of user
program?
Does the problem appear
to be in the input module?
Does the problem appear
to be in the output
module?
When the “POWER” LED is out,
refer to 6.2 “Power Supply Check”
When the “RUN” LED is out,
refer to 6.3 “CPU Check”
When the problem appears
to be in the operation of user
program, refer to 6.4 “Program
Check”.
When the problem appears
to be in the input module,
refer to 6.5 “Input Check”
When the problem appears
to be in the output module,
refer to 6.6 “Output Check”
Lit
Lit
NO
NO
OUT
OUT
YES
YES
YES
When the problem is temporary, and when the problem occurs with the
synchronisation of system/mechanical operations, the influence of the external
environment (such as noise and power fluctuations) may be considered to be
the cause. Since the items to check in this case are collated in paragraph 6.7,
carry out a check referring to that paragraph.
6.1
Troubleshooting
Procedure
When the cause cannot be determined by the above checks, consult
Toshiba.
NOTE