M74CEthernet Communication Module
Connect your M74 series modules on one network.
Ethernet · RS-485
Integrate with industrial networks
Manage up to 31 modules
Manage multiple control modules on one network
Automatic address mapping
Simplify configuration and system setup
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Features
M74C FeaturesM74C is a compact communication module with high-speed data access. It manages up to 31 M74 or M74P modules, with data access at 22.5 ms per module over the dedicated internal bus. Ethernet (Modbus TCP) and RS-485 are standard, together with up to 400 user-defined registers and automatic address mapping.
Compact construction
At approximately 70% of the volume of competing products, M74C helps make efficient use of control-panel space.
Ethernet & RS-485
Supports Ethernet 10/100BaseT and RS-485 at 19,200–115,200 bps.
High-speed interface
Automatically detects connected M74 series modules and provides data access at 22.5 ms per module.
User-defined register map
Assign up to 400 user-defined registers for batch reading and real-time monitoring.
Integrated station & register mapping
Automatically maps the station numbers and register addresses of connected M74 series modules, eliminating separate address-mapping work.
Specifications
View Catalog PDF| General | |
|---|---|
| Model | M74C |
| Supply voltage | 24 V DC |
| Allowable voltage range | 90–110% of rated supply voltage |
| Power consumption | 3 W max. (M74C alone, at maximum load) |
| Display & operation | No built-in display. Configure parameters and monitor/control via an external console, touch panel, PC or PLC. |
| Dimensions | 29(W) × 90(H) × 70(D) mm |
| Communication | |
| Host interface · Ethernet | P1·P2 / Ethernet 10/100BaseT / Modbus TCP |
| Ethernet function codes | 03 Read Holding / 06 Write Single / 16 Write Multiple Registers |
| Host interface · RS-485 | Modbus ASCII/RTU / 19,200~115,200 bps |
| RS-485 function codes | 03 Read Holding / 06 Write Single / 16 Write Multiple Registers |
| Internal bus · Protocol | RS-485 / Modbus RTU / 115,200 bps (fixed) |
| Internal bus · Data format | Even parity / 8 data bits / 1 stop bit |
| PC Loader · Protocol | Modbus RTU / 19,200 bps (fixed) |
| PC Loader · Data format | Even parity / 8 data bits / 1 stop bit |
| Maximum connections · Internal bus | Up to 31 M74/M74P modules per M74C. M74R is subordinate to M74/M74P and is not included in this count. |
| Maximum connections · Host interface | Up to 32 units in RS-485 mode. Ethernet connections depend on IP address allocation. |
| User-defined registers | Up to 400 registers |
| Internal data access | 22.5 ms per module |
| Insulation, Reliability & Environment | |
| EEPROM endurance & retention | At least 4 million write cycles / At least 200 years of data retention |
| Insulation resistance | 100 MΩ min. (500 V DC insulation tester) |
| Insulation construction | Double or reinforced insulation / Dielectric strength of at least 1 kV between measurement input and power supply |
| Dielectric strength | 1,000 V AC, 50/60 Hz for 1 minute, between communication inputs and power terminals |
| Vibration resistance | 5–55 Hz (1-minute cycle), 0.75 mm double amplitude / 2 hours each in X, Y and Z directions |
| Noise immunity | Noise simulator square wave, 1 μs pulse width / ±1 kV |
| Ambient temperature | Operating: −10 to 50 °C / Storage: −20 to 60 °C |
| Ambient humidity | Operating: 35–85% RH / Storage: 35–85% RH |
| Weight | Approx. 187 g with packaging / Approx. 105 g net |
Dimensions & Wiring
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