Home / Mitsubishi Electric (Factory Automation) / Mitsubishi MELSEC-F (FX) Series – Main Unit / FX1S-20MR-D Mitsubishi MELSEC-F (FX) Series Main unit

Available on request

FX1S-20MR-D Mitsubishi MELSEC-F (FX) Series Main unit

MPN: FX1S-20MR-D · Brand: Mitsubishi Electric (Factory Automation)

Price on request

Discontinued by Mitsubishi Electric (Factory Automation) — we can still source the original FX1S-20MR-D (new, used or refurbished, subject to availability). Request a quote below.

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12-month warranty (new) · 3-month (used/refurbished)

30-day returns, no restocking fee on unused parts

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Quick facts

Availability	Confirmed on request
Category	Mitsubishi MELSEC-F (FX) Series – Main Unit
Lifecycle	Discontinued
Warranty	12-month (new) · 3-month (used/refurbished)

Shipping & availability

Can I still buy the FX1S-20MR-D now that it is discontinued?

Yes. Mitsubishi Electric (Factory Automation) has discontinued the FX1S-20MR-D, but sourcing discontinued parts is what PartnerPLC specialises in — new old stock, used and refurbished units. Request a quote and we'll confirm availability, condition and lead time.

When can FX1S-20MR-D be shipped?

FX1S-20MR-D is sourced on request — request a quote and we'll confirm the exact availability and shipping timeline for this specific unit.

Can I pick up FX1S-20MR-D in person?

Local pickup from our Groningen, Netherlands warehouse may be possible — contact us before ordering to check availability and arrange a collection time.

Is express delivery available?

Yes — mention it when you request a quote for FX1S-20MR-D and we'll include express shipping options in our reply.

My factory is down and I need this urgently — can you help?

For a critical breakdown, contact us directly at +31 (0)50-7110348 or sales@partnerplc.com — we can look into same-day courier or dedicated taxi/hotshot delivery for FX1S-20MR-D, subject to availability and destination.

The Mitsubishi Electric FX1S-20MR-D is a main unit in the MELSEC-F (FX) Series. DC Power Supply/DC Input Type Input: 12 points 24 V DC sink Output: 8 points Relay. Mitsubishi Electric has discontinued it (2015/12 Discontinued); PartnerPLC sources discontinued Mitsubishi parts on the surplus market for maintenance of existing machines. Specifications and manuals below are Mitsubishi Electric's own data.

Specifications

Product

Series	MELSEC-F (FX) Series
Category	Main unit
Sales status	2015/12 Discontinued (Mitsubishi Electric)
Outline	DC Power Supply/DC Input Type Input: 12 points 24 V DC sink Output: 8 points Relay

Specifications

Operation control system	Stored program repetitive operation system with interruption function
Input/output control system	Batch processing system (when END instruction is executed), Input/output refresh instruction and pulse catch function are provided.
Programming language	Relay symbol system + step-ladder system (SFC notation possible)
Program memory: Max. memory capacity	2000 steps Up to 2000 steps, including comment and file registers
Program memory: Built-in memory capacity/type	2000-step EEPROM (memory backup not required)
Program memory: Memory cassette (Memory board)	FX1N-EEPROM-8L (8000 steps EEPROM: Only 2000 steps can be used in FX1S)
Program memory: Writing function during running	Provided (Program can be modified while the PLC is running.)
Program memory: Protection	Password protection provided (with entry code function)
Real-time clock: Clock function	Built-in 1980 to 2079 (with correction for leap year), 2- or 4-digit year, accuracy 45 seconds/month at 25 °C *Precaution for clock function The current time of the built-in clock is backed up by a high-capacity capacitor (built-in). The large-capacity capacitor (built-in) fully charges in 30 minutes and retains the current value for ten days.
Kinds of instructions: Basic instructions	・Sequence instructions: 27 ・Step-ladder instructions: 2
Kinds of instructions: Applied instructions	Applied instructions: 85 kinds
Processing speed: Basic instructions	0.55 to 0.7 μs/instruction
Processing speed: Applied instructions	3.7 μs to several hundred μs/instruction
No. of input/output points: No. of input points	16 points or less (in accordance with the input specification) Extension is impossible.
No. of input/output points: No. of output points	14 points or less (in accordance with the output specification) Extension is impossible.
No. of input/output points: Total number of points	30 points or less (in accordance with the I/O specification) Extension is impossible.
Device: Input/output relay: Input relay	X000 to X017 16 points (octal) Extension is impossible. (FX1S-20M□ is supported within the range X000 to X013.)
Device: Input/output relay: Output relay	Y000 to Y015 14 points (octal) Extension is impossible. (FX1S-20M□ is supported within the range of Y000 to Y007.)
Device: Auxiliary relay: For general	M0 to M383 384 points
Device: Auxiliary relay: For keeping	M384 to M511 128 points *Precaution for keeping area The keeping area and non-keeping area are fixed. (Cannot be changed with parameter) The PLC power must be on for at least 5 minutes to accurately keep the data in the EEPROM.
Device: Auxiliary relay: For special	M8000 to M8255 256 points
Device: State: Initial state	S0 to S9 10 points
Device: State: For keeping	All points held during power failure (S0 to S127) *Precaution for keeping area The keeping area and non-keeping area are fixed. (Cannot be changed with parameter) The PLC power must be on for at least 5 minutes to accurately keep the data in the EEPROM.
Device: Timer (on delay): 100 ms	T0 to T62 63 points (0.1 to 3,276.7 sec)
Device: Timer (on delay): 10 ms	When M8028 is turned ON, T32 to T62 (31 points) can be changed to a 10ms timer (0.01 to 327. 67 sec.)
Device: Timer (on delay): 1 ms	T63 1 point (0.001 to 32.767 sec)
Device: Timer (on delay): Others	Available as analog timers VR1: D8030, VR2: D8031 2 points (0 to 255)
Device: Counter: 16 bits up	C0 to C15 16 points (Counting from 0 to 32,767)
Device: Counter: 16 bits up (keeping)	C16 to C31 16 points (Counting from 0 to 32,767) (EEPROM keep) *Precaution for keeping area The keeping area and non-keeping area are fixed. (Cannot be changed with parameter) The PLC power must be on for at least 5 minutes to accurately keep the data in the EEPROM.
Device: High-speed counter	[32 bits high-speed up/down (EEPROM keep)] C235 to C255 1-phase: 60 kHz, 10 kHz 2-phase: 30 kHz, 5 kHz The number of points that can be used and the input frequency are limited depending on the conditions of use. *Precaution for keeping area The keeping area and non-keeping area are fixed. (Cannot be changed with parameter) The PLC power must be on for at least 5 minutes to accurately keep the dat
Device: Data register (32 bits when paired): 16 bits for general	D0 to D127 128 points
Device: Data register (32 bits when paired): 16 bits for keeping	D128 to D255 128 points (EEPROM keep) *Precaution for keeping area The keeping area and non-keeping area are fixed. (Cannot be changed with parameter) The PLC power must be on for at least 5 minutes to accurately keep the data in the EEPROM.
Device: Data register (32 bits when paired): File register (keep)	D1000 to D2499 1500 points (Settable in file register in 500-point units.) (EEPROM)
Device: Data register (32 bits when paired): 16 bits for special	D8000 to D8255 256 points
Device: Data register (32 bits when paired): 16 bits for index	V0 to V7, Z0 to Z7: 16 points
Device: Pointer: For branching of JUMP and CALL	P0 to P63 64 points (For CJ instructions and CALL instructions, P63 jumps to END instruction)
Device: Pointer: Input interruption	I00□ to I50□: 6 points
Device: Nesting	[For master control] N0 to N7: 8 points (For MC instructions)
Constant: Decimal number (K)	16 bits: -32,768 to +32,767 32 bits: -2,147,483,648 to +2,147,483,647
Constant: Hexadecimal number (H)	16 bits: 0 to FFFF 32 bits: 0 to FFFFFFFF

Power supply specifications

Rated voltage	24 V DC
Allowable supply voltage range	24 V DC -15% to +10%
Frequency rating	－
Allowable instantaneous power failure time	Operation can be continued upon occurrence of instantaneous power failure for 5 ms or less.
Power fuse	250 V 0.8 A
Rush current	10 A max. 100 μs/24 V DC
Power consumption	7 W Includes input current (7 or 5 mA per point).
24 V DC service power supply	－

Input specifications

No. of input points	12 points
Input connection type	Terminal block (M3 screw)
Input type	Sink
Input signal voltage	24 V DC ±10%
Input impedance: X000 to X007	3.3 kΩ
Input impedance: X010 or more	4.3 kΩ
Input signal current: X000 to X007	7 mA/24 V DC
Input signal current: X010 or more	5 mA/24 V DC
ON input sensitivity current: X000 to X007	4.5 mA or more
ON input sensitivity current: X010 or more	3.5 mA or more
OFF input sensitivity current	1.5 mA or less
Input response time	Approx. 10 ms X000 to X017 (up to the main unit built-in number) have built-in digital filters, which can be changed to 0 to 15 ms in 1 ms increments using the application D8020. When 0 is specified, X000 and X001 are 10 μs, and X002 to X017 are 50 μs. (FX1S-20M□ is supported within the range of X000 to X013.)
Input signal form	No-voltage contact input NPN open collector transistor
Input circuit insulation	Photocoupler insulation
Indication of input operation	LED is lit when input is on

Output specifications

No. of output points	8 points
Output connection type	Terminal block (M3 screw)
Output type	Relay output
External power supply	250 V AC 30 V DC or less
Max. load: Resistance load	2 A or less/1 output point 8 A or less/COM terminal
Max. load: Inductive load	80 VA
Min. load	5 V DC, 2 mA (reference value)
Open circuit leakage current	－
ON voltage	－
Response time: OFF→ON	Approx. 10 ms
Response time: ON→OFF	Approx. 10 ms
Insulation of circuit	Mechanical insulation
Indication of output operation	When power is applied to relay coil, LED is lit.

Built-in high-speed counter function

1-phase 1-count input	[C235, C236] Up to 2 points: Up to 60 kHz When used High-speed comparison SET/RESET: 30 kHz [C237 to C245] Up to 4 points: Up to 10 kHz When used High-speed comparison SET/RESET: 10 kHz The total frequency processed by the PLC with the high-speed counter and pulse density instruction (add double the input frequency when using a 2-phase counter) is a maximum of 60 kHz. When using the high-speed com
1-phase 2-count input	[C246] Up to 1 points: Up to 60 kHz When used High-speed comparison SET/RESET: 30 kHz [C247 to C250] Up to 2 points: Up to 10 kHz When used High-speed comparison SET/RESET: 10 kHz The total frequency processed by the PLC with the high-speed counter and pulse density instruction (add double the input frequency when using a 2-phase counter) is a maximum of 60 kHz. When using the high-speed compariso
2-phase 2-count input	[C251] Up to 1 point: Up to 30 kHz When used High-speed comparison SET/RESET: 15 kHz [C252 to C255] Up to 2 points: Up to 5 kHz When used High-speed comparison SET/RESET: 5 kHz The total frequency processed by the PLC with the high-speed counter and pulse density instruction (add double the input frequency when using a 2-phase counter) is a maximum of 60 kHz. When using the high-speed comparison S

Specifications

Ambient temperature	0 to 55°C (32 to 131 °F) when operating and -20 to 70°C (-4 to 158 °F) when stored
Ambient humidity	35 to 85%RH (no condensation) when operating
Vibration resistance: Installed on DIN rail: Frequency: 10 to 57 Hz	Half amplitude: 0.035mm Sweep Count for X, Y, Z: 10 times (80 min in each direction) The criterion is shown in IEC61131-2.
Vibration resistance: Installed on DIN rail: Frequency: 57 to 150 Hz	Acceleration: 4.9 m/s 2 Sweep Count for X, Y, Z: 10 times (80 min in each direction) The criterion is shown in IEC61131-2.
Vibration resistance: Direct installing: Frequency: 10 to 57 Hz	Half amplitude: 0.075 mm Sweep Count for X, Y, Z: 10 times (80 min in each direction) The criterion is shown in IEC61131-2.
Vibration resistance: Direct installing: Frequency: 57 to 150 Hz	Acceleration: 9.8 m/s 2 Sweep Count for X, Y, Z: 10 times (80 min in each direction) The criterion is shown in IEC61131-2.
Shock resistance	147 m/s 2 Acceleration, Action time: 11 ms, 3 times by half-sine pulse in each direction X, Y, and Z The criterion is shown in IEC61131-2.
Noise resistance	By noise simulator at noise voltage of 1,000 Vp-p, noise width of 1 μs, rise time of 1 ns and period of 30 to 100 Hz
Dielectric withstand voltage	Perform dielectric withstand voltage test at the following voltage between each terminals and the main unit ground terminal. Between power supply terminal (DC power supply) and ground terminal: 500 V AC for 1 min Between output terminal (relay) and ground terminal: 1.5 kV AC for 1 min
Insulation resistance	Perform insulation resistance test at the following voltage between each terminals and the main unit ground terminal. Between power supply terminal (DC power supply) and ground terminal: 5 MΩ or higher by 500 V DC insulation resistance tester Between output terminal (relay) and ground terminal: 5 MΩ or higher by 500 V DC insulation resistance tester
Grounding	Class D grounding (grounding resistance: 100 Ω or less) (Common grounding with a heavy electrical system is not allowed) Ground the PLC independently or jointly.
Working atmosphere	Free from corrosive or flammable gas and excessive conductive dusts
Working altitude	2000 m or less The PLC cannot be used at a pressure higher than the atmospheric pressure to avoid damage.