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Chapter 2. SPECIFICATIONS
2.4.4 Burn-out Detection Function
The RTD input module has the function of burn-out detection on the Pt100, JPt100 or cable.
1) As shown in the Fig. 2.2, if disconnection occurs in the RTD or cable then a voltage outside the
measurable range voltage is inputted by the internal burn-out detection circuit and burn-out detection
error code is generated.
2) The RTD input module can detect disconnection for each channel. But, burn-out detection is possible
only in the channels enabled.
3) If disconnection is detected in two or more wires, first, disconnection error code is generated by 'b' and
then disconnection error code is generated by 'A' or 'b' sequentially. If disconnection is detected
simultaneously in 'A' and 'B', only disconnection error code is generated by 'b'.
Connection
Method
2-wire
type
3-wire
type
4-wire
type
No wiring
Connection Example
burn-out detection area
burn-out detection area
burn-out detection area
[Fig. 2.2] Burn-out Detection Area
2 - 6
Burn-out Detection
Function
-
- When specified as the
In 4-wire type, only all
enabled channel
: The burn-out detection
function is enabled.
- When not specified as
the enabled channel
: The burn-out detection
function is disabled
*1 : Pt
*2: Shield wire
Remark
wires
marked
'2'
connected
to
the
terminal block A are
all
detected
as
disconnection
then
the A disconnection
error
can
be
detected.
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Troubleshooting
