MNET Series
MNET-8A8R
MNET-8A8R Communication I/O Controller
MNET-8A8R is a communication-type industrial I/O controller with 8 isolated digital inputs and 8 relay 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-8A8R is a communication-type industrial I/O controller with 8 isolated digital inputs and 8 relay 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 relay outputs for AC/DC dry-contact 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 |
|---|---|
| Relay 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-8A8R 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 relay output8 IN / 8 OUT · ISOLATED
Eight isolated inputs and eight dry relay contacts
Both sides are split into two groups of four, and each group has a common of its own. That is what 8P, 4P 1COM means: you can run one group off a 24 V sensor loop and the other off a 5 V one, or switch two circuits that share nothing.
Digital input
| Item | Rating |
|---|---|
| Points | 8P, 4P 1COM |
| Input voltage | DC 5V ~ 24V |
| Input type | NPN / PNP |
| Isolation | Photocoupler isolated |
4P 1COM — points 0–3 share one common and points 4–7 share another, on each side.
Relay output
| Item | Rating |
|---|---|
| Points | 8P, 4P 1COM |
| Contact rating | Max. DC30V or AC300V 5A |
| Output type | Relay (Dry Contact) |
| Isolation | Relay isolated |
Ratings
- The contact rating is the manufacturer's figure: Max. DC30V or AC300V 5A. Do not exceed it.
- Relay contacts are dry: the load supply is yours to provide. Fit a diode, TVS or snubber across an inductive load.
- NPN or PNP is decided by how you wire the 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
Addresses are decimal, exactly as the manufacturer's map prints them. COM poles carry no address because the master never addresses a common.
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.
- Modbus function codes are not published for this model, so none are printed here. Confirm them with ILOGICS before writing the master.
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 relay out. Analog input, PT100 temperature, analog output and pulse output arrive as modules built into the same enclosure — an 8A8R-X2FYK is an 8A8R with 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 |
| 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.
- Only Y1 and Y2 are listed: the manufacturer's map draws a third and fourth analog-output module with more addresses than the module's own 12-point maximum allows. Ask ILOGICS before ordering three or more Y modules.
- 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-8A8R have?▾
The MNET-8A8R provides 8 isolated digital inputs and 8 relay outputs, with onboard RS-485, RS-232, UART, I²C communication. See the specification table for the full breakdown.
Does the MNET-8A8R support Modbus RTU?▾
Yes, as a SLAVE. The MNET-8A8R 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.
