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Thank you for choosing Coolmay FX3GC series PLC. This manual mainly explains the features, general 
specifications and wiring methods of FX3GC series. More detail programming information please refer to 
"Coolmay CX3G&FX3GC PLC Programming Manual".
The FX3GC series is a compact PLC with the following features:
1. Highly integrated. Digital at most 16DI/16DO (digital type can be customized transistor, relay or mixed). 
Analog at most 8AI 6AO, input can be customized temperature, current, voltage or mixed (support-5~5V/
-10V~10V), output can be customized current and voltage. 
2. Comes with two PLC programming ports: MiniB USB port (faster download speed) and RS232 port.
3. Support multi-channel high-speed counting and high-speed pulse functions. High-speed counting 
normally single-phase 6 60KHz, or AB (Z) phase 2 60KHz + AB phase 1 10KHz. High-speed pulse is normally 
8 channels, Y0-Y3 is 100KHz, Y4-Y7 is 10KHz. Acceleration and deceleration are independent; the total of 
high-speed co high-speed pulse cannot exceed 480KHz.
4. Support special encryption. Setting the password to 12345678 can completely prohibit reading programs. 
[Note: Only 8-bit password encryption is supported]
5. Convenient wiring, using 3.5mm pitch pluggable terminals.

Production   Information

Naming rules

FX3GC

1

2

3

4

5

6

7

-

8

9

11

10

Com ports 

(optional)

High-speed counting

High-speed 

pulse

Size

Single 

phase

ABZ  

phase

Output

Dimensions 

(mm)

Normally 

8 channels, 

Y0-Y3 is 100KHz, 

Y4-Y7 is 10KHz; 

HSC + HSP 

can not 

exceed 

480KHz.

90*65*32

Model

Digital 

points

Analog 

(optional)

DI DO

MAX 

AI

MAX 

AO

CAN 

(2.0A/B)

MT: Y0-Y7 is MOS tube output, Y10-Y17 is transistor output; MR: relay output; MRT: mixed output. 
Optional according to customer requirements.

FX3GC PLC User Manual

Installation size

Mechanical   Design   Reference

Filter function

High-speed counting

Input level

With filter function, the filter time can be set among 0-60ms, 

defaulted as 10ms

Normally single phase 6 channels 60KHz or AB (Z) phase 

2 channels 60KHz + AB phase 1 channel 10KHz

Passive NPN, common terminal isolation, S/S connected to 24V+

Digital relay output index

Max current

Load voltage

Circuit insulation

On response time

Mechanical life (no load)

Electrical life (rated load)

Output level

2A/point, 5A/8point COM

Below DC30V/ Below AC220V

Relay mechanical insulation

About 10ms

10 million times

300,000 times

Normally open dry contact output, COM can be connected to positive or negative

Digital transistor output index

Max current

Load voltage

Circuit insulation

Isolation voltage 

(power supply-external terminal)

On response time

High-speed frequency output

Output level

MOS tube: 2A/point, 4A/4point COM, 5A/12point COM; 

MT: 0.5A/point, 0.8A/4point COM, 1.6A/12point COM

DC24V

Optocoupler insulation

1500VAC

High-speed output: 10

μ

s, other 0.5ms

Normally 8 channels, Y0-Y3 is 100KHz, Y4-Y7 is 10KHz

Low level NPN, COM connected to negative

Analog input index

Input signal

Response time

Analog input quantity

Accurary

1 scan cycle

0-8 Channel

12 bits

Analog output index

Output signal

Analog output quantity

Accurary

0-6 Channel

12 bits

External interface

Programming port

Environment

Operating temperature

Relative humidity

Storage temperature

Vibration frequency

0°C~50°C

5%~95%RH

-20°C~70°C

10-57Hz, amplitude 0.035mm; 57Hz-150Hz, acceleration speed 4.9m/s² 

(10 times each on X, Y, Z, total 80 minutes each)

Comes with 2 programming ports: Mini B USB port 

(faster download speed) and Rs232

                                        

 2 Product structure

Diagram

1. 35mm rail installation

                             

2. Terminal block for power input signal

4. Digital input display LED

                        

5. Digital output display LED

                                          

8. PLC programming port

9. RUN/STOP PLC operation switch

       

10. Analog input (optional 485)

11. Analog output (optional CAN)

          

12. Digital input terminal block

7. Optional RS485

                

Diagram 1 Installation dimension drawing

 

Dimensions 90*65*32(mm)

Product  structure

90

6

5

32

6

9

1

8

12

3

2

7

10

11

4

4

5

5

00

01

02
03
04
05
06
07

00

01

02
03
04
05
06
07

RUN
ERR
PWR

Y

   

Diagram 3 FX3GC-16MR/MT/MRT

Electrical   Design   Reference

Hardware interface

Basic parameters

FX

C

3G -16M

8

8

FX

C

3G -30M

FX

C

3G -32M

16 14

16 16

N

o

n

e

Diagram 6 FX3GC-32MR/

MT/MRT

00

01

02
03
04
05
06
07

00

01

02
03
04
05
06
07

RUN
ERR
PWR

Y

10

11

12
13
14
15
16
17

10

11

12
13
14
15
16
17

Y

Diagram 5 FX3GC-30MR/

MT/MRT

00

01

02
03
04
05
06

07

00

01

02
03
04
05
06
07

RUN
ERR
PWR

Y

10

11

12
13
14
15
16
17

10

11

12
13
14
15

A
B

Y

Y

              

is the public terminal of switch output;

485/CAN

-

1P

-

1C1

-

A0

-

V

-

4DA

8AD

-

RT

M

16

3. Digital output terminal block

Terminal wiring specifications: 22-14AWG wire. The terminals of this series of models are all pluggable terminals.
For special model interfaces, please refer to the product silk screen.

other customization

0-5V/0-10V/-10~10V/-5~5V/0-20mA/4-20mA/other customization

Electrical parameters

Input voltage

DC 24V

Digital input index

Isolation mode

Input ON

Input resistance

Input OFF

Photoelectric coupling

High-speed input 3.3K

Ω

Common input 4.3

Ω

Electric current of high-speed input 

is higher than 5.8mA/24V

Electric current of common input 

is Higherthan 9.9mA/24V

Table 2 Electrical parameters

(

Continued from the table above)

Pin No.

Signal

Description

5

8

GND

TXD

Ground

Send

4

RXD

Receive

① ②

③ ④ ⑤

⑥ ⑦

Diagram 8 Optional 

communication port

Table 1: Basic parameters

8

4

6

4

1

2

1

1

8

6

1

1

None

None

None

None

Electric current of high-speed input 

is higer than 4.5mA/19V

Electric current of common input 

is Higher than 4mA/17V

High-speed co high-speed pulse total does not exceed 480KHz

PT100/PT1000/thermocouple/NTC/0-10V/0-5V/-10~10V/-5~5V/0-20mA/4-20mA

Note: For detailed settings, please refer to "Coolmay CX3G&FX3GC Series PLC Programming Manual"

Diagram 7 RS232 

programming port

 RS232 programming port pin definition

GND is the common terminal of analog input/analog output

Diagram 4 FX3GC-16M 

communication port/analog expansion

00

01

02
03
04
05
06
07

00

01

02
03
04
05
06
07

RUN
ERR
PWR

Y

A0

A

1

A

2

A

3

A4
A5
A6
A7

D

0

D

1

D

2

D

3

D4
D5

A
B

1

3

                                          

13. Mini USB programming port (faster download speed)

S

/

S

S

/

S

S

/

S

S

/

S

S

/

S

S

/

S

Note: S/S is the common terminal of digital input, which is connected to the positive pole of 24V;

GND

GND

A1
B1

H
L

(

)

485+ A

1

485-  B

1

485+ A

485-  B

H

L

~

AB phase

Normally 

single 
phase 

6 channels 

60KHz

Normally 

AB phase 

2 channel 

60KHz+

1 channel 

10KHz

Normally 

ABZ phase 

2 channel 

60KHz

 

Installation size: DIN rail (35mm) 

Refer to

Table 1: Basic parameters

COM

 

port

3

12

Comes with two programming ports: 

Mini B-type USB port (faster download speed) and RS232 (8-pin mouse female socket)
16M can expand at most 2 RS485, 1 CAN port (2.0A/B), 6 inputs and 4 outputs analog  
                                                 Or 1 RS485, 1 CAN port (2.0A/B), 8 inputs and 4 outputs simulation

Or 1 RS485, 8 inputs and 6 outputs analog
Or 2 RS485, 1 CAN port (2.0A/B)

                                                 
                                                 

1. Series:         FX3GC: FX3GC series PLC
2. I/O points:         16: 8DI 8DO    30: 16DI 14DO   32: 16DI 16DO
3. Module         M: Main Module
4. DO type:         R: Relay; T: Transistor; RT: Relay and transistor mixed
5. AI         0-8 channels are optional
6. AO         0-6 channels are optional
7. AI type         

V: 0 -10V       V5: 0-5V       V_: -10~10V        V5_: -5~5V       A0: 0-20mA       A4: 4-20mA       

    
8. AO type

V: 0-10V       V5: 0-5V       A0: 0-20mA       A4: 4-20mA        V_: -10~10V       V5_: -5~5V       

   [Note: Optional negative voltage occupies two DA channels]
9. C1 means single-phase high-speed counting, C2 means AB phase counting, and C3 means ABZ phase counting. 
     Normally single phase 6 channels 60KHZ, or AB (Z) phase 2 channels 60KHz + AB phase 1 channel 10KHz.
10. P0 means 10KHz high-speed pulse, P means 100KHz high-speed pulse. High-speed pulse normally 
    8 channels, Y0-Y3 is 100KHz, Y4-Y7 is 10KHz; acceleration and deceleration are independent; high-speed 

co high-speed pulse total cannot exceed 480KHz.

11. COM port.

Refer to

Table 1: Basic parameters

PT: PT100       PT1000: PT1000       NTC: Thermistor (10K/50K/100K)       

    

E: E type thermocouple (K type/T type/S type/J type can be customized, supporting negative temperature) 

       

    

       

                                      

 RS485

Communication port description

Serial port 1: RS422 (PLC programming port): Supports Mitsubishi programming port protocol, 
which can be used to download PLC programs or communicate with devices that support 
Mitsubishi programming port protocol.
Serial port 2: RS485 (AB port): Support Mitsubishi programming port protocol, Mitsubishi BD protocol, 
RS protocol and Modbus RTU protocol.
※ Support RS, RS2, WR3A, RD3A, ADPRW instructions. 
Serial port 3: RS485 (A1B1 port): Supports Mitsubishi programming port protocol, RS2 protocol and 
Modbus RTU protocol.
※Support RS2, WR3A, RD3A, ADPRW instructions.
CAN  port: supports RS2 protocol and Modbus RTU protocol.
※Support RS2, WR3A, RD3A, ADPRW instructions. 

6. PWR: Indicates the power-on state
RUN: The light is on when the PLC is running

    

ERR: The indicator light flashes when the program 
error occurs (the indicator light is on when the
CPU error occurs)

(

)

N

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