Toshiba AD268 Manuale Utente

User’s Manual   

The table below shows the trouble and its remedy.

Trouble

Module

status info

LED

Module operation

Cause

Remedy

Input type
setting error

Bit 7 is ON

ON
(if the error
occurs in all
channels, it
is OFF)

The error channel
stops the
conversion. The A/D
conversion data is 0.

Invalid input type
parameter was set.

Set the correct
input type
parameter.

Analog signal
wire breakage
(4-20mA only)

Bit 8 is ON

ON

The A/D conversion
data of the channel
is 0.

In the 4-20mA
input, less than
4mA signal is input.

Check the analog
signal wire.

Analog signal
limit over

Bit 9 is ON

ON

The A/D conversion
data of the channel
is limited by the limit
value.

Analog input signal
is out of the range.

Check the signal
source (sensor).

MPU error

Bit A is ON

OFF

The A/D conversion
is stopped.

Internal processor
operation is not
normal.

Execute reset
command, or
cycle power off
and on.

ROM error

Bit B is ON

OFF

The A/D conversion
is stopped.

EEPROM data
error is detected.

Cycle power off
and on.

DP-RAM error Bit C is ON

OFF

The A/D conversion
is stopped.

Buffer memory
access error is
occurred.

Cycle power off
and on.

External 24V
error

Bit E is ON

OFF

The A/D conversion
is stopped.

Internal 

±

15V

voltage is not
normal.

Check the
external 24Vdc
power supply.

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