Bitronics 878 High Density I/O

Man, That's Dense.

Up to 56 Digital and Transducer Points, IEC 61850 including GOOSE, and All 3 PRC-002 Recording Modes in One Box

The Bitronics 878 High Density I/O provides combinations of digital inputs, digital outputs, and transducer inputs. All I/O is accessible via IEC 61850, DNP3, or ModBus protocols (serial or TCP) for substation equipment monitoring. The substation hardened 878 design and flexible distributed communications capability allows it to be installed virtually anywhere in the substation. Built from the M871 platform, with  over ten years’ field experience, the 878 High Density I/O carries the Bitronics tradition of quality construction backed by a ten-year unconditional guarantee.  Custom built and pre-wired enclosures and mounting options available.

The 878 is built from the same platform as the M871/872 Event Recorders, and utilizes the same CPU, fiber optic and copper Ethernet options, Power Supply, Digital I/O, and transducer input modules. The 878 can accept an IRIG-B time synchronization signal via one of its three configurable serial ports, permitting time stamping of events accurate to one millisecond or better.

Configuration is via the 70 Series Configurator and IEC 61850 Configurator software. The digital outputs are controlled via CONTROL RELAY OUTPUT BLOCK objects and support LATCH-ON, LATCH-OFF, PULSE-ON, PULSE-OFF and TRIP/CLOSE commands. The 878 can report all input changes as time-stamped DNP3 events. The digital inputs can be assigned to any of the DNP3 classes via the ASSIGN-CLASS function or via the 70 Series Configurator.

IEC 61850 GOOSE can communicate a binary status over Ethernet, analogous to status and control performed by discrete I/O points. GOOSE messages are reliable enough to be used for controlling interlocks and protective relay blocking schemes, and can be propagated even faster than discrete digital contacts because of the time that it takes for moving mechanical parts to operate. Individual SOE reports can be generated within each 878. An OrionLX can generate SOE reports by monitoring events from multiple 878 units.

Product Features

  • Universal power supply with a nominal range of 24-250Vdc and 69-240Vac with 25-35W output
  • Optional Ethernet module (standard for IEC 61850 units)
  • Three to six I/O modules (see below)
  • CE marked and support of IEC 61850 8-1 with GOOSE messaging
  • Dedicated input circuit to monitor each output
  • Boolean Logic Toolkit
  • Fast Control schemes with OrionLX or PLCs
  • Up to 56 binary inputs, 24 binary outputs, or 48 transducer (analog) inputs
  • Three chassis sizes available: 8.5″ (216 mm), 10.9″ (277 mm) or 13.45″ (342 mm) wide. All are 3U (5.2″ or 132 mm) high and 8.8″ (224 mm) deep
  • H12 host processor with a 486 microprocessor and 256MB of non-volatile memory

Digital Input / Output Module Features (P30A, P31)

  • Digital inputs are jumper selectable for low range (nominal system voltages of up to 100V) or high range (from 100 to 300V) as well as normally open or normally closed
  • Inputs protected against continuous overload to 300Vdc on low input range
  • All I/O terminals protected with internal transient limiting devices
  • Input De-bounce Time is selectable, from 60ns to 260s in 60ns steps (one time for all inputs)
  • Removable Terminal Blocks, accepts #16-28AWG (1,4-0,09mm) wire
  • Digital outputs have protection and control industry standard-type output relays and circuitry to ensure system reliability
  • All outputs have “wrap-around” inputs to allow confirmation of circuit operation
  • Rated for 2000Vac, 1min isolation, I/O to I/O, and I/O to case
  • Removable terminal block for ease of installation
  • Output Operate Time (time from command by Host, does not include protocol delays): Assert (Close time with “N.O.” jumper): 8ms; Release (Open time with “N.O.” jumper): 3ms
  • P31 has 12 dedicated digital inputs (points 5-16) and 4 combined/configurable inputs/outputs (points 1-4); P30A has 4 dedicated and 4 combined

Transducer Input Module Features (P40)

  • Transducer input is available in 0- 1mA (Overload Range: -2.5 mA to +2.5 mA) , 4-20mA (Overload Range: 0 mA to +25 mA), or 0-10V (Overload Range: -12.5 V to + 12.5 Vdc) ranges and are jumper selectable for voltage or current range.
  • Input terminals have internal transorb clamp and 90V spark gap protection.
  • All range options are accurate to 0.25% of full scale.
  • Data update rate (poll rate) is 100 ms minimum for a single input module, and 500 ms minimum when multiple modules are used


  • Operating Range: -40C to +70C
  • UL/CSA Recognized, File Number E164178
  • UL61010-1, 2nd edition (July 12, 2004; revision date 2008-10-28)
  • CAN/CSA No. 61010-1-04 (2nd edition, dated July 12,2004)

Product and Generic Standards

  • Low Voltage (Product Safety): EN 61010-1:2011
  • EMC: EN 612326-1: 2006, EN60255-26:2006, EN 61000-6-2:2005, EN 61000-6-4:2007/A1:2011 (IEC date 2010).
  • Surge Withstand Capability Test for Protective Relays and Relay Systems: ANSI/IEEE C37.90.1: 1989
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