Sensor Connection; Table 3 - Disconnection Detection - Honeywell 2MLF-RD4A User Manual

2. Specifications
2.3. RTD input module characteristics
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.
Connection Status
Normal
B line disconnected
Sensor not connected

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.
30 Resistance Temperature Detector 2MLF-RD4A User's Guide
Table 3 – Disconnection detection
Channel Setting Status
Specified
Not specified
Specified
Not specified
Specified
Not specified
Honeywell
LED Status
(Disconnection Flag ON/OFF)
OFF (Disconnection Flag OFF)
OFF (Disconnection Flag OFF)
Blinking (Disconnection Flag ON)
OFF (Disconnection Flag OFF)
Blinking (Disconnection Flag ON)
OFF (Disconnection Flag OFF)
R200
September 2010