X20 system modules • Temperature modules • X20AT4222
X20 system User's Manual 3.10
2403
4.31.4.4 LED status indicators
For a description of the various operating modes, see the 2.11.1 "re LEDs" section.
Figure
LED
Color
Status
Description
Off
No power to module
Single flash
RESET mode
Blinking
PREOPERATIONAL mode
r
Green
On
RUN mode
Off
No power to module or everything OK
On
Error or reset status
e
Red
Single flash
Warning/Error on an I/O channel. Overflow or underflow of the analog inputs.
e + r
Red on / Green single flash
Invalid firmware
Off
The input is switched off
Blinking
Overflow, underflow or open line
1 - 4
Green
On
Analog/digital converter running, value OK
4.31.4.5 Pinout
Channels that are not being used should be disabled.
1
X
20
A
T
42
22
2
1
Sense - 1
Sensor - 1
2
Sense - 2
Sensor - 2
Sense - 3
3
Sensor - 3
4
Sense - 4
Sensor - 4
3 4
3 4
r
e
4.31.4.6 Connection example
GND
+24 VDC
GND
+24 VDC
AT
Se
ns
or
1
Se
ns
or
3
Se
ns
or
2
Se
ns
or
4
3-wire
connection
2-wire
connection
+
+
_
_
_
_
+
+
_
_
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