MNET Series
MNET-8A8T
MNET-8A8T Communication I/O Controller
MNET-8A8T is a communication-type industrial I/O controller with 8 isolated digital inputs and 8 transistor (sink) outputs. Onboard RS-232, RS-485, UART, I²C, operating as a Modbus RTU or LS ELECTRIC Cnet slave — the protocol is chosen at order time. It runs no user program: a master device such as a PC, HMI or PLC reads and writes the I/O over the serial link. DIN-rail mountable for automation, testing, HMI integration and machine control.
Chosen once, at order time. It cannot be changed to the other protocol after the unit ships.
Adding an expansion module means the unit is dismantled and re-assembled to order, so such an order is difficult to exchange or refund. Some combinations are not available on some models; if yours cannot be built we will contact you.
International shipping (EMS · DHL · UPS) — calculated at checkout by destination & weight
Ships the next business day (regardless of order time)
Large orders may take 1 extra day to dispatch
Cancel before dispatch · request a return/exchange after delivery
Overview
/ OVERVIEWMNET-8A8T is a communication-type industrial I/O controller with 8 isolated digital inputs and 8 transistor (sink) outputs. Onboard RS-232, RS-485, UART, I²C, operating as a Modbus RTU or LS ELECTRIC Cnet slave — the protocol is chosen at order time. It runs no user program: a master device such as a PC, HMI or PLC reads and writes the I/O over the serial link. DIN-rail mountable for automation, testing, HMI integration and machine control.
Key features
- Controlled entirely over the bus — no firmware to write. A PC, HMI or PLC master reads and writes the I/O as Modbus RTU or LS ELECTRIC Cnet slave (protocol chosen at order time).
- 8 opto-isolated digital inputs, NPN/PNP selectable
- 8 transistor (sink) outputs for fast DC switching
- Industrial communication: RS-485, RS-232, UART, I²C · Modbus RTU
- DIN-rail 35 mm mountable, isolated field I/O for the factory floor
Specifications
/ SPEC| Digital inputs | 8 |
|---|---|
| Transistor outputs | 8 |
| RS-232 | 1ch |
| RS-485 | 1ch |
| UART | 1ch |
| I²C | 1ch |
| Modbus RTU | Yes |
| LS Cnet | Yes |
Communication and terminalsMODBUS RTU / LS CNET SLAVE
The program runs on your master, not on this unit
MNET-8A8T is a communication slave. A PC, SCADA station, HMI or PLC opens a serial link, and from that moment the field I/O is simply a set of addresses it reads and writes. There is no firmware to write, no toolchain to install, and no board to flash — which is why the protocol is fixed once, at order time.
Three serial terminals
RS-232, RS-485 and TTL UART are all brought out to screw poles. Wire the one your master uses.
Slave, by design
The station number is called a slave address, and it is set on the unit itself. The master owns the conversation.
Chosen at order time
Modbus RTU slave or LS ELECTRIC Cnet slave. One unit speaks one of them, and it cannot be changed after shipping.
Terminal strip (silkscreen)
Poles are drawn exactly as the product silkscreens them. The +5V pole belongs to Int VCC; its allowed current is not stated in any source, so no figure is printed here.
| Group | Poles | Count |
|---|---|---|
| RS-232 | TX · RX · GND | 3-pole |
| RS-485 | 485+ · 485− | 2-pole |
| UART | TXD · RXD · GND | 3-pole |
| I2C / Int VCC | SDA · SCL · +5V · GND | 4-pole |
| POWER | +24V · GND · F.G | 3-pole |
Before you wire it
- Match the protocol you ordered to the driver on the master. A Modbus master cannot talk to a Cnet unit.
- RS-485 is a two-wire pair: check 485+ / 485− polarity, and consider twisted pair, shielding and termination on a long run.
- F.G is a field ground pole, not a signal return. GND is the return.
System layout
The three links are alternatives, not three simultaneous channels — wire the port your master actually uses.
Digital input and transistor output8 IN / 8 OUT · ISOLATED
8 isolated inputs and 8 transistor outputs
The input side divides into 2 groups of 4, each with a common of its own — that is what 8P, 4P 1COM means. The output side works differently: the 8 points form a single block, and the load supply enters the unit on its own two poles, Ext Vin+ · Ext Vin−. There is no output common to share, so the load circuit is powered by what you feed those poles.
Digital input
| Item | Rating |
|---|---|
| Points | 8P, 4P 1COM |
| Input voltage | DC 5V ~ 24V |
| Input type | NPN / PNP |
| Isolation | Photocoupler isolated |
Inputs: 4 points per common, so 2 commons. Outputs: no common — 8 points in one block fed from the external load supply on Ext Vin+ · Ext Vin−.
Transistor output
| Item | Rating |
|---|---|
| Points | 8P, SINK (negative-voltage) output |
| Output rating | Max. DC60V 1A |
| Output type | Transistor |
| Isolation | Photocoupler isolated |
Ratings
- The output rating is the manufacturer's figure: Max. DC60V 1A. Do not exceed it.
- Supply the load through Ext Vin+ · Ext Vin−. Fit a diode, TVS or snubber across an inductive load — relays, solenoids and motors all need one.
- NPN or PNP is decided by how you wire the input common, so check the sensor's polarity before power-up.
I/O register mapDECIMAL ADDRESSES
Every point has a number, and that number is the whole interface
Once the link is up, using this unit is reading and writing decimal addresses. Inputs are 0 to 7, outputs are 32 to 39, and the status bit is 1000. The LS ELECTRIC Cnet side maps onto the same points in the P area.
Terminals and their addresses
DIGITAL INPUT
TRANSISTOR OUTPUT
Addresses are decimal, exactly as the manufacturer's map prints them. Ext Vin+ · Ext Vin− carry no address: they are the load-supply poles, and the master addresses only points.
Status bit
| Item | Modbus RTU | LS Cnet |
|---|---|---|
| STATUS | 1000 | M0000 |
Reading the map
- These are the unit's internal addresses. An HMI that expects 1-based display addresses will need its own offset — check what your driver sends on the wire.
- This model's Modbus function codes are published in its manual: FC02 to read inputs, FC01 to read outputs, FC05 / FC15 to write them.
Baud rate and slave addressDIP SWITCH
Two dip blocks, one rule: the left switch is worth the most
Communication speed and station number are set on the unit, with no software involved. Both blocks read the same way — the leftmost switch is the most significant bit, and a slider pushed toward the ON mark counts.
How to read the switches
Both patterns were re-derived from the manufacturer's artwork by measuring every slider: all 24 published patterns match this rule.
| Setting | Baud rate |
|---|---|
| 0 | 9,600 |
| 1 | 14,400 |
| 2 | 19,200 |
| 3 | 28,800 |
| 4 | 38,400 |
| 5 | 57,600 |
| 6 | 76,800 |
| 7 | 115,200 |
Slave address 0 – 15
| Address | Switches ON |
|---|---|
| 0 | — |
| 1 | 4 |
| 2 | 3 |
| 3 | 3 · 4 |
| 4 | 2 |
| 5 | 2 · 4 |
| 6 | 2 · 3 |
| 7 | 2 · 3 · 4 |
| 8 | 1 |
| 9 | 1 · 4 |
| 10 | 1 · 3 |
| 11 | 1 · 3 · 4 |
| 12 | 1 · 2 |
| 13 | 1 · 2 · 4 |
| 14 | 1 · 2 · 3 |
| 15 | 1 · 2 · 3 · 4 |
Setting it
- Master and unit must agree on speed, data bits, parity and stop bits. Only speed and address are set here; the rest is not published for this model.
- The factory default position is not documented, so read the switches on the unit rather than assuming one.
- Every unit on one RS-485 bus needs a different address.
Expansion I/O modulesX · F · Y · K
Analog, temperature and pulse, added at order time
The base unit is digital in and transistor out. Analog input, PT100 temperature, analog output and pulse output arrive as modules built into the same enclosure — the name 8A8T-X2FYK means 8A8T plus two X modules, one F, one Y and one K. Choose them in the options above; the address each one answers on is listed below.
| Module | Type | Detail | Maximum |
|---|---|---|---|
| X | Analog input | 4 points (DC 0–5 V, DC 0–10 V, 0(4)–20 mA, NTC sensor) | up to 5 modules (20 points) |
| F | PT100Ω temperature input | 4 points (−200 °C to +800 °C, 2-wire or 3-wire) | up to 5 modules (20 points) |
| Y | Analog output | 3 points (DC 0–5 V, DC 0–10 V, 0(4)–20 mA, 16-bit) | up to 4 modules (12 points) |
| K | Pulse output | 6 points (DC 5 V, 30 mA max, up to 1 MHz) | up to 2 modules (12 points) |
Addresses by module
| Module | Channels | Modbus RTU | LS Cnet |
|---|---|---|---|
| X1 | 0 ~ 3 | 2000 ~ 2003 | D0000 ~ D0003 |
| X2 | 4 ~ 7 | 2004 ~ 2007 | D0004 ~ D0007 |
| X3 | — | 2008 ~ 2011 | D0008 ~ D0011 |
| X4 | — | 2012 ~ 2015 | D0012 ~ D0015 |
| X5 | — | 2016 ~ 2019 | D0016 ~ D0019 |
| F1 | 0 ~ 3 | 2040 ~ 2043 | D0040 ~ D0043 |
| F2 | 4 ~ 7 | 2044 ~ 2047 | D0044 ~ D0047 |
| F3 | — | 2048 ~ 2051 | D0048 ~ D0051 |
| F4 | — | 2052 ~ 2055 | D0052 ~ D0055 |
| F5 | — | 2056 ~ 2059 | D0056 ~ D0059 |
| Y1 | 0 ~ 2 | 2020 ~ 2022 | D0020 ~ D0022 |
| Y2 | 3 ~ 5 | 2023 ~ 2025 | D0023 ~ D0025 |
| Y3 | 6 ~ 8 | 2026 ~ 2028 | D0026 ~ D0028 |
| Y4 | 9 ~ 11 | 2029 ~ 2031 | D0029 ~ D0031 |
| K1 | 0 ~ 1 | 2060 ~ 2065 | D0060 ~ D0065 |
| K2 | 2 ~ 3 | 2066 ~ 2071 | D0066 ~ D0071 |
Channels are shown where the manufacturer's map labels them. X3–X5 and F3–F5 are drawn with their addresses only, so only the addresses are given.
Reading the value
| Module | Value on the wire |
|---|---|
| X | Analog sent as 15-bit (0–32,767) · in NTC mode, temperature × 10 (21.3 °C → 213) |
| F | Temperature × 10 is sent (21.3 °C → 213) |
| Y | Receives 16-bit (0–65,535) and drives the voltage / current output |
| K | WIDTH fixed at 65,535 · duty received as 0–65,535 |
X module — NTC mode addresses
| Module | Modbus RTU | LS Cnet |
|---|---|---|
| X1 | 2080 ~ 2083 | D2080 ~ D2083 |
| X2 | 2084 ~ 2087 | D2084 ~ D2087 |
An X module set to NTC mode is read from these registers, not from its analog addresses above. The manufacturer's map prints this block for X1 and X2 only.
Before ordering a module
- Adding a module means dismantling and reassembling the unit, so exchange and refund are difficult after purchase.
- Some combinations are not possible; ILOGICS will contact you if an order cannot be built as specified.
- Changing the pulse frequency or the number of pulse outputs is a made-to-order change — ask ILOGICS.
Downloads
/ FILESFAQ
How many I/O points does the MNET-8A8T have?▾
The MNET-8A8T provides 8 isolated digital inputs and 8 transistor outputs, with onboard RS-485, RS-232, UART, I²C communication. See the specification table for the full breakdown.
Does the MNET-8A8T support Modbus RTU?▾
Yes, as a SLAVE. The MNET-8A8T answers a master — a PC program, HMI or PLC — over RS-232, RS-485 or UART. The protocol is chosen when you order: Modbus RTU slave or LS ELECTRIC Cnet slave. It is never the master, and it runs no user program.
