2. Specifications
2.3. RTD input module characteristics
30
Resistance Temperature Detector 2MLF-RD4A User's Guide
R200
Honeywell
September 2010
4.
The standard connection between 2MLF-RD4A module and RTD sensor is based
on 3-wire RTD sensor. Disconnection will be detected on the basis of 3-wire wiring
even if a 2-wire or 4-wire sensor is used.
Table 3 – Disconnection detection
Connection Status
Channel Setting Status
LED Status
(Disconnection Flag ON/OFF)
Normal
Specified
OFF (Disconnection Flag OFF)
Not specified
OFF (Disconnection Flag OFF)
B line disconnected
Specified
Blinking (Disconnection Flag ON)
Not specified
OFF (Disconnection Flag OFF)
Sensor not connected
Specified
Blinking (Disconnection Flag ON)
Not specified
OFF (Disconnection Flag OFF)
Sensor connection
1.
There are three types of sensor-connecting methods available.
a)
2-wire
b)
3-wire
c)
4-wire
2.
The standard wiring method for 2MLF-RD4A module is 3-wire.