6F3B0253

Basic Hardware and Function 283

10. Troubleshooting
10.1.1 Power supply check

If the PWR (power) LED is not lit after power on, check the following points.

Check the power connection Connection terminals are correct.
The terminal screws are not loose.
The terminal block i s installed securely.
Correct
Check the power vol tage 85 to 132/170 to 264Vac (50/60 Hz)
at the T1-16S’s terminal or 20.4 t o 28.8Vdc (DC power)
Normal
Remove the programmer If the PWR LED becomes norm al, the
port connector internal 5Vdc can be s horted in the
external connections of t his port.
Still unlit
Remove the 24Vdc service If the PWR LED becom es normal, the
power terminals if it is used 24Vdc service power can be over l oad.
Still unlit
Remove the I/O modules. If the PWR LED is still unlit, the T1-16S
basic unit may be fault y. Replace the unit.
Lit
Confirm the inter nal 5Vdc The 5Vdc capa city for I/O modules is
current consumption if max. 1.5A.
I/O module is used. (Refer to section 2.1.)
Within the limit
Insert the removed option Replace th e fau lty I/O module.
modules one by one to
pinpoint the faulty card.