420Mdbs; Wiring Details - Honeywell 301 Serie Mode D'emploi

420MDBS

Wiring Details

The 420MDBS replaces the standard four position sensor plug normally provided with all Manning 4-20mA out-
put sensors. Since the plug is a stand-alone device, only two (2) wires are required to power the plug (see Fig-
ure 1), thereby powering the sensor as well.
The 420MDBS module is wired using the terminal block located at the bottom of the module (see Figure 1).
Important notes:
The maximum number of modules on a single daisy chain twisted pair is 32.
•
The last module on a chain must have an "End of Line" terminating jumper installed. See Diagram 1.
•
There are two options for the EOL.
Option one is a purely resistive termination "R". This is most common and should be used first.
Option two is a resistive/capacitive termination "RC". Use this option only if system is installed in a noisy "high
RF or nearby strong electric fields". This option is a trial and error approach and should be attempted only
when sporadic packet loss occurs in communication.
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Figure 1. Manning 420MDBS Wiring Diagram
Figure 2. Modbus address labels