A-10
Appendix 5.2 When the A1S64TC RUN LED flashes or turns OFF
(1) When flashing
Check item
Corrective action
2sec. on/2sec. off
Isn’t the write data error flag (X2)
on?
l
Check the error code list in appendix 4 and
correct the sequence program.
1sec. on/1sec. off
Hardware error
l
There is an A1S64TC hardware error. Return
the hardware to the nearest retail store or cor-
porate office.
(2) When turned off
Check item
Corrective action
Is the 5VDC supplied?
l
Check the power module.
l
Install the module securely.
Confirm if the current capacity total
of the modules installed to the base
unit is below the power supply
module’s current capacity.
l
Set the current capacity total of the modules in-
stalled to the base unit below the current capac-
ity of the power supply module.
Isn’t the watchdog timer error (X0)
on?
l
Perform a reset or restart power supply again
for the PC CPU.
l
Replace the A1S64TC.
Appendix 5.3 When the ALM LED is turned ON or flashing
(1) When turned on
Check item
Corrective action
Check if there is a channel where
the platinum tempera-
ture-measuring resistor is not con-
nected
l
Set the channel, where the platinum tempera-
ture-measuring resistor is not connected, to
unused in the buffer memory addresses 3DH,
5DH, 7DH, and 9DH.
Check if the alert flag (XC to XF) is
turned on.
l
Check buffer memory addresses 5H to 8H, then
take steps depending on the contents.
(2) When flashing (ON for one second and OFF for one second)
Check item
Corrective action
Check if the measured value ex-
ceeds the measurement tempera-
ture range specified in the input
range setting.
l
Change the input range setting to the tempera-
ture range in use.
