Back to top

STRB 4 Channel Turbine Accumulator Input Smart Card

This product has been discontinued. This web page is provided so current customers using the product can have a quick reference for specifications. Please contact Automation Electronics for current products that may meet your needs.

4 channel turbine meter input smart card4 Channel Turbine Accumulator Input Smart Card

The Automation and Electronics, Inc. STRB was designed to provide turbine meter and pulse input expansion capability for Programmable Logic Controllers (PLCs). With a low power requirement and a wide operating temperature range, the STRB is ideal for use in remote 120 VAC, 24 VDC, or solar powered distributed I/O systems. It can also be used as a stand-alone MODBUS turbine meter and pulse input module.

The STRB is a microprocessor based four-channel accumulator board. This card is capable of accumulating pulses directly from either turbine meter magnetic pickups or dry contact closures. Jumpers are provided for each channel to select the type of pulse input being used. The on-board microprocessor accumulates these pulses, and makes them available to either host systems or master controllers via a serial data highway.

The data highway is implemented using the built in RS-485 serial port. All of the Smart Card series can be daisy chained together using these serial ports. Each Smart Card responds to MODBUS polls or commands from a master. An on-board address selector switch allows each board to be easily configured for any MODBUS address. This RS-485 data highway can then be used to create a scalable, flexible input / output expansion array.


  • Accumulator storage backup (24 hour via on-board capacitor)
  • MODBUS RTU protocol
  • On-board address switch (0-255)
  • Four on-board option switches
  • Two RJ45 jacks for RS-485 serial data
  • Selectable RS-485 termination
  • Expansion connector for our P-type piggyback modules


Size: 4-1/2" x 9" PC board
Mounting: Snap track
Operating temperature: -40 to +158 deg. F (-40 to +70 deg. C)
Relative humidity: 5 to 90% non-condensing
Power requirements
Typical: Processor - Less than 100 mA @ 10 to 30 VDC
CPU / Memory
CPU: 68HC11
Memory: 128 kB flash, 32 kB EEPROM, 2 kB RAM
Input configuration
Turbine: 30 mV to 1 VDC @ 10-3,000 Hz (10,000 Hz for Channel 1)
Pulse: Dry contact or open collector type, 5 VDC @ 2 mA, 0-30 Hz or 0-200 Hz
Accumulators: 16-bit (0-65535)
RS-485: 9,600 baud; two RJ45 connectors
Protocols: MODBUS RTU protocol