IO-28 Modbus Controller
Protocols Support
Supports Modbus RTU which provides flexibility for implementation.
High-Speed Data Rates
Multiple serial communication (RS-485) speed selection from 9.6kbps to 76.8kbps.
Device ID
Complementing existing standard protocols, the IO-28 Controller can be uniquely identified over the network. This facilitates online network device search and simplify reconfiguration.
Multiple Input/Output Type
The controller has eight (8) Digital Inputs, eight (8) Analogue Input for current, voltage, resistance and temperature sensor, eight (8) Digital Outputs (relay) and four (4) Analogue Output (current and voltage.
High Accuracy Analogue Channels
High speed 12-bits A/D converter with programmable gain amplifier yields a high resolution and accuracy reading on analogue input points. 10-bits D/A provides more accurate analogue output control.
Status Indicator
Operational activity on each individual channel of DI, DO, Power and Operation are conveniently indicated by LEDs.
Reset & Broadcast Switch
A Reset Switch has been provided for system reset without power removal (Warm Start operation).
Configuration
Network communication and operation parameters can be changed via RS-485 with the built-in boot-loader and terminal program.
Robust System Operation
The controller has a built-in High Accuracy Real Time clock with backup battery. Software and hardware watchdog timer are provided for high reliability operation.
Ease of Installation
All I/Os are connected via field removable terminal block connectors for easy maintenance. The controller casing fits standard DIN rail mounting.
Inputs & Outputs
Universal Input:
• 8 Channels (12 bits Resolution)
o Voltage: 0 – 10V
o Current: 0 – 20mA
o Resistance: 0 – 30k (± 10Ω), 0 – 10k (± 5Ω)
o Thermistor: 10k, 10k Shunt
Analogue Output:
• 4 Channels (10 bits Resolution)
o Voltage: 0 – 10V
o Current: 4 – 20mA (up to 550Ω load)
Digital Input:
• 8 Channels
o Type: Voltage Free
Digital Output:
• 8 Channels
o Type: Relay Contacts, SPST NO, Pilot Duty
▪ Max Rating: 5A, 250VAC/30VDC
Supply Connection & Environmental Limits
• Power Supply: 24VAC ± 5% or 24 VDC ± 5%
• Consumption: 3.6VA max or 300mA max
• Operating Temperature: 32° to 150° F (0° to 65° C)
• Storage Temperature: -4° to 150° F (-20° to 65° C)
• Operating Humidity: 10% to 95% HR (non-condensed)
Communication
Physical Interface 1 (Port 1):
• EIA-485 Standard (Bus A, B) two-wire
• Half Duplex
• Baud Rate Speed: 9.6k, 19.2k, 38.4k, 76.8k, 115.2k bit/s
• Data Bit: 8 bits
• Application Protocol: Modbus
• Multi-drop Capability: Yes (Hardware ID Setting)
Status Indicators
• Power Status LED
• Operation Status LED
• Communication Status LED
• Error Status LED
• Digital Input, Digital Output
Mechanical
• Dimension: 187mm (L) x 129mm (W) x 45mm (H)
• Material: UL94 ABS
• Weight: 420g
Input/Output
1) Digital Input
2) Digital Output
3) Analogue Input
4) Analogue Output
5) Digital State Latch
6) Digital State Timer
7) Digital State Counter
Conversion
8) Table Conversion