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Mitsubishi Electric FX3U-232ADP-MB — PLCs (Programmable Logic Controllers)

Mitsubishi FX3U-232ADP-MB RS-232C Modbus Adapter, Mature Lif

MPNFX3U-232ADP-MB

Mitsubishi FX3U-232ADP-MB RS-232C communication adapter, Modbus RTU/ASCII master or slave, 5 VDC 30 mA from PLC backplane, D-SUB 9-pin male connector.

$72.00Ref. price · indicative, final on quote
Mitsubishi Electric FX3U-232ADP-MB datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

FX3U-232ADP-MB key specifications
ParameterValue
Withstand voltageD-SUB 9Pin connector and between the ground terminal of the basic unit: AC500V 1 minute
Power supplyDC5V 30mA (internal power supply from the sequencer)
Frequency57 ~ 150Hz Acceleration: 9.8m / s2 X, Y, Z each direction 10 times (for a total of each 80 minutes)
Direct mounting at the time frequency10 ~ 57Hz Half amplitude: 0.075mm X, Y, Z each direction 10 times (for a total of each 80 minutes)
Vibration resistance when the DIN rail mounting frequency10 ~ 57Hz Half amplitude: 0.035mm X, Y, Z each direction 10 times (for a total of each 80 minutes)
Communication systemFull-duplex bi-directional
Communication procedure· MODBUS communication (master or slave) - No-protocol communication , computer link (dedicated protocol format 1, dedicated protocol format 4) programming communication
Programming communication9600/19200/38400/57600/115200 (bps)
No-protocol communication, computer link300/600/1200/2400/4800/9600/19200/38400 (Bps) FX3U, FX3UC is, later Ver.2.41, it supports 38400bps.
Communication speed MODBUS communication300/600/1200/2400/4800/9600/19200/38400/57600/115200 (bps) corresponds to 38400/57600 / 115200bps from products manufactured on or after July 2012. (Serial number: 127 **** or later)
External device connection methodD-SUB 9Pin connector (male)
Operating temperature0 ~ 55 °C ····· operation, -25 ~ 75 °C ····· during storage

All specifications

FX3U-232ADP-MB additional specifications
ParameterValue
Relative humidity5 ~ 95% RH (non-condensing) ...... operation
Shipping weight1 Kg
Transmission standardRS-232C compliant
Mass0.08kg
Impact147m / s2, duration of action 11ms, X at half-sine pulse, Y, Z directions 3 times each
Anti-noiseNoise voltage 1,000Vp-p, noise width 1μs, due to rising 1ns, cycle 30 ~ 100Hz of noise simulator
Advanced use2000m or less can not be used in the pressurized environment to more than atmospheric pressure. There is a possibility of failure.
DisplayRD, SD, POWER
Use atmosphereCorrosive, there is no flammable gas, conductive dust (dust) that is not terribly
Apply sequencer[FX3S] V1.00 and later: corresponding to all the communication function [FX3G] V1.00 and later: communication functions other than the MODBUS communication to the corresponding V1.30 and later: corresponds to the MODBUS communication function [FX3U] V2.20 and later: other than MODBUS communication communication function to the corresponding of V2.40 and later: corresponds to the MODBUS communication function [FX3GC] V1.40 and later: corresponding to all the communication function [FX3UC] V1.00 and later: corresponds to the communication functions other than the MODBUS communication V2.40 and later: MODBUS corresponding to the communication function
Insulation methodPhotocoupler
O occupied points0 points (no relation to the maximum input and output points of the sequencer)
Estimated lead time1 - 10 Working Days
Insulation resistanceD-SUB 9Pin connector and between the ground terminal of the basic unit: DC500V 5MΩ more in insulation resistance tester
Transmission distanceUp to 15m

Product details

The Mitsubishi FX3U-232ADP-MB is a dedicated RS-232C communication adapter for the FX3U series PLCs, supporting Modbus RTU/ASCII as master or slave, plus no-protocol and computer link modes. It draws 30 mA at 5 VDC from the PLC backplane, so no external power supply is needed — the bus provides it. The D-SUB 9-pin male connector mates directly to a standard serial port; transmission distance is limited to 15 m at RS-232C levels, which is typical for this physical layer. Protocol selection and baud rate are set in the PLC program, not DIP switches.

PLC firmware compatibility

This adapter works across the FX3S, FX3G, FX3U, FX3GC, and FX3UC families, but the firmware version determines which communication functions are available. For FX3U, MODBUS communication requires V2.40 or later; earlier versions support only no-protocol and computer link modes. On FX3G and FX3UC, MODBUS requires V1.30 and V2.40 respectively. FX3S and FX3GC support all functions from V1.00 onward. If you are swapping this into an existing panel, check the PLC firmware version before committing the BOM line.

MODBUS baud rate timing

The MODBUS communication speed ranges from 300 to 115200 bps. Units manufactured before July 2012 (serial number below 127xxxx) are limited to 38400 bps maximum on MODBUS. The higher rates — 57600 and 115200 bps — are supported only on units with serial number 127xxxx or later. For no-protocol and computer link modes, the top speed is 38400 bps on FX3U and FX3UC from V2.41 onward. If your application requires 115200 bps MODBUS, verify the serial number on the nameplate.

Environmental and isolation ratings

Operating temperature range is 0 to 55 °C, storage from -25 to 75 °C, with 5 to 95% RH non-condensing. The adapter uses photocoupler insulation between the D-SUB connector and the PLC ground terminal, rated for AC 500 V for one minute, with insulation resistance above 5 MΩ at DC 500 V. Vibration resistance when DIN-rail mounted is 10 to 57 Hz at 0.035 mm half-amplitude; direct mounting allows 0.075 mm. Impact rating is 147 m/s² for 11 ms half-sine pulse in X, Y, Z directions. The unit is not rated for use above 2000 m altitude or in pressurized environments.

Frequently asked questions

What PLC firmware versions are required for MODBUS communication?

For FX3U, MODBUS requires V2.40 or later. For FX3G, V1.30 or later. For FX3UC, V2.40 or later. FX3S and FX3GC support all functions from V1.00 onward.

What is the maximum MODBUS baud rate?

Up to 115200 bps, but only on units manufactured July 2012 or later (serial number 127xxxx or higher). Earlier units are limited to 38400 bps for MODBUS.

Does the FX3U-232ADP-MB require external power?

No. It draws 30 mA at 5 VDC from the PLC backplane via the expansion bus.

What is the transmission distance?

Up to 15 m, standard for RS-232C.

MPN
FX3U-232ADP-MB