| Multi-Channel Temperature Control Modules, Thermocouple or Millivolt Input, Limit Alarms or Discrete Outputs. |
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Features
- Standard Modbus-RTU protocol with high-speed RS-485 communication (up to 115K bps)
- 16-bit sigma-delta A/D yields 0.1°C resolution and 0.5°C measurement accuracy
- Thermocouple linearization and sensor break detection ensure reliable measurements
- Four discrete outputs enable local temperature limit alarms or host-controlled on/off switching
- Heavy-duty 1A solid-state relays provide dependable on/off control of industrial devices
- Self-calibration lowers maintenance costs by reducing periodic manual calibration checks
- Watchdog timers provide a configurable failsafe output state for use when host I/O communication is lost
- Four-way isolation eliminates potential ground loops between power, input, output and network circuitry
- Self-diagnostics monitor microcontroller activity to detect operational failures (lock-up) and execute a reset to restore communication.
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Description
A collection of analog and discrete I/O modules with Modbus-RTU protocol network communication. These modules are ideal for a wide variety of distributed I/O applications including data acquisition and control, process monitoring, and test and measurement. Modules may be connected over a maximum communication path of 4,000 feet. DI-900MB modules are not supported by WinDaq software, but their Modbus protocol support allows them to be used with a wide range of process control and monitoring software products.
The DI-900MB Series I/O System is a collection of analog and discrete I/O modules with Modbus-RTU protocol network communication. These modules are ideal for a wide variety of distributed I/O applications including data acquisition & control, process monitoring, and test & measurement. Windows-based configuration software simplifies module setup with easy selection of input/output ranges, alarm setpoints, and other operating parameters.
All DI-900MB I/O modules communicate over a high-speed RS-485 network supporting data transfer rates up to 115K baud. Analog input modules accept variable DC voltage, current, and thermocouple sensor signals and feature local limit alarm capabilities. Analog output modules provide DC voltage or current field control signals for local displays, recorders, variable frequency drives, valves, and other control equipment. Discrete I/O modules monitor and/or control the on/off status of industrial devices. All modules may be mixed/matched and coexist on the same Modbus network in a manner that precisely addresses the requirements of any given application.
Product Highlight
This signal conditioner is a four-channel analog input module with four discrete outputs. It filters and linearizes thermocouple inputs while providing isolation between input, output, power, and network circuits. Cold junction compensation and upscale/downscale sensor break detection are standard. AC and DC power sources are supported with nonpolarized, diode-coupled terminals.
The programmable inputs accommodate eight thermocouple types plus wide-range millivolt signals. Flexible discrete outputs operate as alarms or on/off controllers. As limit alarms, each discrete output can be configured with high and/or low setpoints exclusively tied to an analog input channel. Alarm trips function without host communication enabling low-cost stand-alone alarms as well as local backup for the primary control system. Otherwise, on/off control is based on commands issued by the host system.
Combining flexible transmitter functions, mixed signal I/O, alarm support, and a network interface in a single package, makes this instrument extremely powerful. Multi-channel design adds cost-efficiency and allows high-density mounting. Plus, safe, rugged construction makes these modules reliable for use in both control room and distributed field I/O applications. Custom module configurations are also possible (consult factory for details).
Everything you need to complete your network is available from Techno-Test Instruments, Inc. - isolators, signal converters, signal boosters, power sources, and mounting hardware.
DI-900MB Accessories
DI-900MB Configuration Kit (Model 100969)
Includes the Configuration Software for Windows (95, 98, ME, NT, 2000, XP) on CD-ROM; a non-isolated RS-232 to RS-485 Serial Port Converter, DB-95 to DB-9F; and an 8 ft. Cable, RS-485 to 3-wire Cable Converter, DB-9M to 3 x 12 AWG RS-485. These components provide everything you need to set up a Series DI-900MB module from your desktop PC before installing it on the network.
Isolated Network Repeater (Models 100977 and 100978)
This unit isolates and boosts RS-485 signals to extend communication distances or increase the number of devices on the network. Each Repeater permits the addition of a network branch with up to 32 devices (including the Network Repeater) and will transmit RS-485 signals another 4000 feet. Operation is transparent to all devices and no handshaking is required. Two terminal blocks are provided for 120 ohm resistors to terminate both ends of the network branch. Use model number 100979 for power cable.
USB Converter (Model 100970)
USB-to-RS232 adapter.
50W Power Supply (Model 100980)
Universal supply drives DC-powered signal conditioners.
AC Current Sensor (Model 100973)
AC Current Sensor - for use with DI-913MB modules only. One required per channel.
DIN-Rail Mounting (Model 100971)
Our 19" rack-mount kit provides a clean solution for mounting your I/O modules and a power supply. Holds up to 16 DI-900MB modules.
Specifications
DI-924MB 4-channel thermocouple/millivolt input module.
Input: 4 channels, thermocouple (types J, K, T, R, S, E, B, N) or millivolt (+/-100mV DC) input
Alarms: 4 channels, open drain MOSFETS (1A DC loads, 0 to 35V DC)
Power: 10 to 36V DC, 24V AC
Network Communication: Modbus-RTU high-speed RS-485
