Acromag, Inc. BusWorks™ 900 MB Series DC Current Output Module 917MB-0900

4 analog output channels 0 to 20mA or 0 to 10V DC output range 4 discrete output channels, open drain MOSFETS (1A DC loads, 0 to 35V DC) 10 to 36V DC, 24V AC power Modbus RTU high-speed RS-485 These modules drive four analog output channels and also feature four discrete outputs for on/off control. Isolation separates the output, power, and network circuits. Network communication adheres to the industry-standard RS-485 Modbus RTU protocol. AC and DC power sources are supported with nonpolarized, diode-coupled terminals. The analog outputs generate a signal based on communication from the host. They accommodate wide DC voltage or current ranges. Discrete outputs provide simple on/off switching capability for external devices. Combining analog outputs, on/off controllers, 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 make it reliable for both control room and distributed field I/O use in a broad range of temperature control applications. Custom module configurations are also possible (consult factory for details). Features Standard Modbus RTU protocol with high-speed RS-485 communication (up to 115K bps) 12-bit D/A yields 0.1% of span resolution and accuracy Four outputs in a single inch-wide module reduces system costs and saves panel space Four discrete outputs enable 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 Three-way isolation eliminates potential ground loops between power, output and network circuitry Self-diagnostics monitor microcontroller activity to detect operational failures (lock-up) and execute a reset to restore communication Operating temperature: -25°C to +60°C (-13°F to +140°F), limit 917MB ambient to 50°C maximum for supply voltages less than 15V