FAD-40 Technical Manual, Rev.2.1.0; February 2022
Page 21 of 55
5.
FAD-40
/
FAD-40MB
WITH
RS-485
I
NTERFACE
FAD-40 and FAD-40MB instruments are state-of-the-art strain gauge load cell signal digitizers with RS-485
interface. These instruments are used for any type of process weighing and force measurement including tank
and silo weighing, dynamic weighing, check weighing, filling, tension /compression force measurement etc.
5.1. Front View of FAD-40 (MB)
There are 3 status LEDs on the front panel which indicate the operational instrument status (Refer to table 6.1).
The setup switch on front panel of the instrument is used for RS-485 addressing without PC (Refer to chapter
5.6) and for diagnostics (Refer to chapter 12).
When the error LED is ON, the other two LED indicate the error type (Refer to chapter 11 for details).
Load cell connection, power supply and serial interface terminals are located at the front of the DIN rail mount
instrument (See figure 6.1).
Status LEDs
Digital I/O and RS-485 Connector
Load Cell Connector
Setup Switch
Power Supply Terminal
Figure 6.1
– Front view
The meanings of these LEDs in operation are described below.
LED
Operational Mode
Symbol
Name
Weight / Force
Count
Stable
Stable
Unstable
Off for 0.3 seconds in 2 seconds
period (No stable indication)
Centre
of Zero
in the center of zero range
(-0.25 e < w < 0.25 e)
Out of center of zero range
Always off
(No center of zero indication)
Err
Error
( * )
ADC conversion error
Digital processing error
No error
ADC conversion error
Digital processing error
No error
Off
On
Flashing Off for 0.3 seconds
( * ) : Refer to the error table in chapter 11
Table 6.1
– Status LEDs
