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.
EMS or international air parcel — choose at checkout; rates depend on destination and weight
Shipping weight 350 g (per unit)
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
Products ordered with the “Expansion module” option are modified to your order before shipping, so they cannot be returned or exchanged for a change of mind.
Key features
/ 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 terminals
MNET-8A8R is a communication slave: a PC, SCADA station, HMI or PLC opens one serial link and the field I/O becomes a set of addresses it reads and writes. The protocol — Modbus RTU or LS ELECTRIC Cnet — is fixed at order time and cannot be changed after shipping.
| Terminal | Silkscreen poles | Count |
|---|---|---|
| RS-232 | Silkscreen polesTX · RX · GND | Count3-pole |
| RS-485 | Silkscreen poles485+ · 485− | Count2-pole |
| UART | Silkscreen polesTXD · RXD · GND | Count3-pole |
| I2C / Int VCC | Silkscreen polesSDA · SCL · +5V · GND | Count4-pole |
| POWER | Silkscreen poles+24V · GND · F.G | Count3-pole |
The three links are alternatives, not three simultaneous channels — wire the port your master actually uses.
Communication start-up sequence
- Confirm the protocol you ordered — Modbus RTU slave or LS ELECTRIC Cnet slave. One unit speaks one of them.
- With the power off, wire ONE of the serial ports — RS-232 · RS-485 · UART — to your master.
- Set the baud rate and the slave address (0 – 15) on the unit's dip switches.
- Match the master to those settings: baud rate, data bits, parity, stop bits and the slave address it targets.
- Apply power on the POWER terminal (+24V · GND · F.G).
- Read one input point to prove the link — Modbus 0 / Cnet P0000.
- Then drive one output point — Modbus 32 / Cnet P0032.
- Once both answer, map the full address list into your master's tag table.
Digital input and relay output
8 isolated inputs and 8 dry relay contacts. Each side divides into groups with a common of its own — the inputs into 2 of 4, the relay outputs into 2 of 4 — and the two sides are wired independently.
Digital input
| Item | Rating |
|---|---|
| Points | Rating8P, 4P 1COM |
| Input voltage | RatingDC 5V ~ 24V |
| Input type | RatingNPN / PNP |
| Isolation | RatingPhotocoupler isolated |
Relay output
| Item | Rating |
|---|---|
| Points | Rating8P, 4P 1COM |
| Contact rating | RatingMax. DC30V or AC300V 5A |
| Output type | RatingRelay (Dry Contact) |
| Isolation | RatingRelay isolated |
Inputs: 4 points per common, so 2 commons. Relay outputs: 4 points per common, so 2 commons. The two sides are wired independently.
Basic I/O addresses
Once the link is up, using this unit is reading and writing decimal addresses: inputs 0 to 7, outputs 32 to 39, status bit 1000. The LS ELECTRIC Cnet side maps the same points onto its P area.
Addresses are decimal, exactly as the manufacturer's map prints them. COM poles carry no address because the master never addresses a common.
| Item | Points | Modbus RTU | LS Cnet | Access |
|---|---|---|---|---|
| Digital input | Points8 pt | Modbus RTU0 ~ 7 | LS CnetP0000 ~ P0007 | AccessRead |
| Relay output | Points8 pt | Modbus RTU32 ~ 39 | LS CnetP0032 ~ P0039 | AccessRead / Write |
| Status bit | Points1 pt | Modbus RTU1000 | LS CnetM0000 | AccessRead |
Modbus function codes are not published for this model, so none are printed here. Confirm them with ILOGICS before writing the master.
DIP switch settings
Communication speed and station number are set on the unit itself, with no software involved: in both blocks the leftmost switch is the most significant bit and a slider pushed toward ON counts. Every unit on one RS-485 bus needs a station number of its own, and the range is 0 – 15.
| Setting | Baud rate |
|---|---|
| 0 | Baud rate9,600 |
| 1 | Baud rate14,400 |
| 2 | Baud rate19,200 |
| 3 | Baud rate28,800 |
| 4 | Baud rate38,400 |
| 5 | Baud rate57,600 |
| 6 | Baud rate76,800 |
| 7 | Baud rate115,200 |
| Slave address | Switches ON |
|---|---|
| 0 | Switches ON— |
| 1 | Switches ON4 |
| 2 | Switches ON3 |
| 3 | Switches ON3 · 4 |
| 4 | Switches ON2 |
| 5 | Switches ON2 · 4 |
| 6 | Switches ON2 · 3 |
| 7 | Switches ON2 · 3 · 4 |
| 8 | Switches ON1 |
| 9 | Switches ON1 · 4 |
| 10 | Switches ON1 · 3 |
| 11 | Switches ON1 · 3 · 4 |
| 12 | Switches ON1 · 2 |
| 13 | Switches ON1 · 2 · 4 |
| 14 | Switches ON1 · 2 · 3 |
| 15 | Switches ON1 · 2 · 3 · 4 |
Option modules
Analog input, PT100Ω temperature, analog output and pulse output arrive as modules built into the same enclosure, chosen in the options above. The name 8A8R-X2FYK means 8A8R plus two X modules, one F, one Y and one K.
| Module | Type | Detail | Maximum |
|---|---|---|---|
| X | TypeAnalog input | Detail4 points (DC 0–5 V, DC 0–10 V, 0(4)–20 mA, NTC sensor) | Maximumup to 5 modules (20 points) |
| F | TypePT100Ω temperature input | Detail4 points (−200 °C to +800 °C, 2-wire or 3-wire) | Maximumup to 5 modules (20 points) |
| Y | TypeAnalog output | Detail3 points (DC 0–5 V, DC 0–10 V, 0(4)–20 mA, 16-bit) | Maximumup to 4 modules (12 points) |
| K | TypePulse output | Detail6 points (DC 5 V, 30 mA max, up to 1 MHz) | Maximumup to 2 modules (12 points) |
Reading the value
| Module | Value on the wire |
|---|---|
| X | Value on the wireAnalog sent as 15-bit (0–32,767) · in NTC mode, temperature × 10 (21.3 °C → 213) |
| F | Value on the wireTemperature × 10 is sent (21.3 °C → 213) |
| Y | Value on the wireReceives 16-bit (0–65,535) and drives the voltage / current output |
| K | Value on the wireWIDTH fixed at 65,535 · duty received as 0–65,535 |
Option module addresses
| Module | Channels | Modbus RTU | LS Cnet |
|---|---|---|---|
| X1 | Channels0 ~ 3 | Modbus RTU2000 ~ 2003 | LS CnetD0000 ~ D0003 |
| X2 | Channels4 ~ 7 | Modbus RTU2004 ~ 2007 | LS CnetD0004 ~ D0007 |
| X3 | Channels— | Modbus RTU2008 ~ 2011 | LS CnetD0008 ~ D0011 |
| X4 | Channels— | Modbus RTU2012 ~ 2015 | LS CnetD0012 ~ D0015 |
| X5 | Channels— | Modbus RTU2016 ~ 2019 | LS CnetD0016 ~ D0019 |
| F1 | Channels0 ~ 3 | Modbus RTU2040 ~ 2043 | LS CnetD0040 ~ D0043 |
| F2 | Channels4 ~ 7 | Modbus RTU2044 ~ 2047 | LS CnetD0044 ~ D0047 |
| F3 | Channels— | Modbus RTU2048 ~ 2051 | LS CnetD0048 ~ D0051 |
| F4 | Channels— | Modbus RTU2052 ~ 2055 | LS CnetD0052 ~ D0055 |
| F5 | Channels— | Modbus RTU2056 ~ 2059 | LS CnetD0056 ~ D0059 |
| Y1 | Channels0 ~ 2 | Modbus RTU2020 ~ 2022 | LS CnetD0020 ~ D0022 |
| Y2 | Channels3 ~ 5 | Modbus RTU2023 ~ 2025 | LS CnetD0023 ~ D0025 |
| Y3 | Channels6 ~ 8 | Modbus RTU2026 ~ 2028 | LS CnetD0026 ~ D0028 |
| Y4 | Channels9 ~ 11 | Modbus RTU2029 ~ 2031 | LS CnetD0029 ~ D0031 |
| K1 | Channels0 ~ 1 | Modbus RTU2060 ~ 2065 | LS CnetD0060 ~ D0065 |
| K2 | Channels2 ~ 3 | Modbus RTU2066 ~ 2071 | LS CnetD0066 ~ 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.
| NTC mode | Modbus RTU | LS Cnet |
|---|---|---|
| X1 | Modbus RTU2080 ~ 2083 | LS CnetD2080 ~ D2083 |
| X2 | Modbus RTU2084 ~ 2087 | LS CnetD2084 ~ 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.
Changing the pulse frequency or the number of pulse outputs is a made-to-order change — ask ILOGICS.
Important notes X · F · Y · K
Expansion modules (X · F · Y · K) are built into the same enclosure as the base unit, in the configuration you order. That is why the combinations have limits.
Before you order
- Adding an expansion module means the unit is assembled to your order, so such an order is difficult to exchange or refund.
- Analog input (X) and PT100Ω temperature input (F) — up to 20 points between them.
- Analog output (Y) and Pulse output (K) — up to 12 points between them.
- A combination that cannot be built is disabled in the option selector, so it cannot be chosen.
FAQ
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.
