Table of Contents
MPS-8A4R-S
MPS-8A4R-S is a all-in-one industrial PLC with 8 digital inputs and 4 relay with independent COM terminals outputs. A single PCB integrates voltage and current analog inputs, NTC temperature sensor inputs, PWM, high-speed inputs, and RS-232 communication.
Program with ladder logic using MP STUDIO.
Product Specifications
| Category | Quantity | Terminal / Item | Specifications |
|---|---|---|---|
| Programming method | - | - | MP STUDIO MP STUDIO2 (Ladder logic program) |
| Power | - | Supply voltage | DC 12~24V (0.5A or more when using DC 24V) DC 24V power is required for relay operation. |
| Digital inputs | 8 points (Solid-state, isolated) | P0~P7 | operating input voltage: DC 0~40V HIGH detection voltage: DC 5V or higher COM0: P0~P3, COM1: P4~P7 NPN/PNP input support |
| Relay outputs | 4 points (Mechanical contacts, isolated) | P32~P35 | operating connection voltage: DC 0~30V or AC 0~250V maximum allowable output current: 5A/1 points Separate COM for each contact |
| Analog inputs | 2 points (Non-isolated) | AI0, AI1 | input voltage: DC 0~5V or DC 1~5V resolution: 10bit (0~1023) input resistance: 100MΩ (±1%) |
| Analog inputs | 2 points (Non-isolated) | AI2, AI3 | input current: 0~20mA or 4~20mA Resolution: 0~20mA is 10bit (0~1023); 4~20mA is 0~818 input resistance: 250Ω (±1%) |
| Analog inputs | 2 points (Non-isolated) | AI4, AI5 | input voltage: DC 0~10V resolution: 10bit (0~1023) input resistance: 200kΩ (±1%) |
| Temperature sensor inputs | 2 points (Non-isolated) | NTEMP channels 0 and 1 | input temperature: -40~120℃ Sensor: NTC 3950K, 10kΩ(25℃) Resolution: 0.1℃ (at 0~40℃) |
| High-Speed Counter / Encoder | 2 channels (Non-isolated) | Channel 0: CLK(A), DIO(B) Channel 1: SDA(A), SCL(B) | input voltage: DC 0~5V input frequency: Max. 50kHz Channel 1 is shared with I²C |
| Pulse outputs | 3 points (Non-isolated) | PWM0~PWM2 | output voltage: LOW(DC 0V), HIGH(DC 5V) maximum output current: 30mA |
| Communication Channels | 1 channel (Non-isolated) | I²C | I²C master supported Shared with high-speed counter / encoder channel 1 |
| RS-232 | Modbus RTU Slave LS Industrial Systems Cnet(XGK) Slave Cubloc Modbus RTU Slave IBUS Master·Slave |
||
| Memory | - | Flash | 128KB (32KB used by system) |
| Data Memory | 8KB (1KB used by system) |
Digital inputs
See the one-channel digital-input check before wiring for the first time. →
| Terminal | Input Configuration | Wiring example |
|---|---|---|
| P0~P3 | 4 digital inputs, sharing COM0 |  |
| P4~P7 | 4 digital inputs, sharing COM1 |
The digital inputs are isolated by optocouplers and accept DC 5~24V NPN or PNP signals. Select the input type by wiring the COM terminal accordingly.
Relay outputs
See the one-channel relay-output check before wiring for the first time. →
| Contact | Contact ratings | COM configuration | Wiring example |
|---|---|---|---|
| P32 | AC 250V or DC 30V, Max. 5A | Separate COM |  |
| P33 | AC 250V or DC 30V, Max. 5A | Separate COM | |
| P34 | AC 250V or DC 30V, Max. 5A | Separate COM | |
| P35 | AC 250V or DC 30V, Max. 5A | Separate COM |
Each relay point has its own independent COM terminal. Relay contacts are dry contacts that do not supply power; connect a separate load power supply.
The relay coils operate at DC 24V. With only a DC 12V supply or USB power from the download cable, the controller may operate, but the relays will not.
Analog / Temperature inputs
| channel | Input Type | Input Range | Function block used | Wiring example |
|---|---|---|---|---|
| AI0, AI1 | Voltage input | DC 0~5V or DC 1~5V | ADC or ADC2 |  |
| AI2, AI3 | Current input | 0~20mA or 4~20mA | ADC or ADC2 |
|
| AI4, AI5 | Voltage input | DC 0~10V | ADC |
|
| NTEMP channels 0 and 1 | NTC temperature sensor inputs | NTC 10kΩ, 3950K | NTEMP |
For DC 1~5V or 4~20mA signals, use the ADC2 function block; the input value range is 0~818.
PWM and High-Speed Inputs
| Function | Contacts / Channels | Points | Wiring example |
|---|---|---|---|
| PWM outputs | PWM0~PWM2 | 3 points |  |
| High-speed counter inputs | Channels 0 and 1 | 2 channels |  |
| Encoder Inputs | Channels 0 and 1 | 2 channels |  |
| I²C · High-speed input ch. 1 | SDA(A), SCL(B) | 1 channel | |
| FND / ENCO / High-speed input channel 0 | CLK(A), DIO(B) | 1 channel |
The 1 high-speed counter/encoder channel shares the I²C SDA·SCL signals. I²C communication cannot be used simultaneously while the 1 high-speed input channel is in use.
PWM0~PWM2 share one timer, so all three outputs must use the same frequency and WIDTH.
Communication and Upload
| Function | Terminals / Cables | Usage | Wiring example |
|---|---|---|---|
| Program download | MP Download Cable | MP STUDIO program download / monitoring |  |
| RS-232 | TX, RX, +5V, GND | Modbus RTU Slave, LS Industrial Systems Cnet(XGK) Slave, Cubloc Modbus RTU Slave, IBUS Master·Slave | |
| I²C | GND, 5V, SDA, SCL | I²C master, 1:N communication |
The +5V output on the RS-232 terminals supports up to 0.5A.
Basic I/O example
The ladder below activates the P32 relay when input P0 turns ON.
0000 [ P0:Run button ]────────────────( P32:Relay )