EL6861 EtherCAT Terminal BACnet-MS/TP

May 12, 2017
EL6861 EtherCat Terminal connects up to 64 BACnet field devices.

EL6861 EtherCAT Terminal supports BACnet MS/TP in addition to BACnet/IP for building automation. A serial interface can be used to directly control and monitor BACnet-compatible field devices, such as pumps, drives, and frequency converters without the need for additional gateways or routers.


Up to 64 devices with RS485 low power transceivers can be connected to this I/O terminal. In addition, several terminals can be operated in parallel to scale the number of supported MS/TP channels.


Using the 1-channel BACnet MS/TP interface, hardware and engineering costs can be significantly reduced since the configuration is performed centrally in the TwinCAT System Manager and external devices such as routers or gateways are no longer required. Combined with the BACnet MS/TP driver integrated within TwinCAT automation software, the EL6861 terminal implements BACnet in compliance with Revision 12 of the protocol. The terminal can also be used locally without routing to the BACnet/IP network.


The RS485 interface guarantees high interference immunity through electrically isolated signal transmission. The EL6861 provides 1 x 5V DC at 20 mA (electrically isolated, short-circuit-proof) from the EtherCAT E-bus supply for use with bias resistors (network bias).

TechnologyD-sub, 9-pinDevices32, up to 64 if ultra-low power transceivers are usedData transfer channels1Data transfer rates9,600; 19,200; 38,400; 57,600; 76,800; and 115,200 baudInterfaces1 x RS485Termination resistorexternally via ZB3100 or ZS1031-3000 connectorBias resistor (network bias)externally via ZB3100 or ZS1031-3000 connectorCable lengthmax. 500 m twisted pairProviding external supply1 x max. 5V/20 mA, out of E-bus supply, short-circuit proofPower supplyvia the E-busElectrical isolation500V (E-bus/signal voltage)Bit width in the process image128 x 8-bit input, 128 x 8-bit output, 16-bit control, 16-bit statusConfigurationconfiguration via controller, TwinCATCurrent consumption E-bustyp. 170 mASpecial featurescan only be used with TwinCATWeightapprox. 55 gOperating/storage temperature-13 to 140°F / -40 to 185°FRelative humidity95%, no condensationVibration/shock resistanceEN 60068-2-6/EN 60068-2-27EMC immunity/emissionEN 61000-6-2/EN 61000-6-4Protect. rating/installation pos.IP20/variableApprovals/markingsCE, UL


Design formcompact terminal housing with signal LEDsMaterialpolycarbonateDimensions (W x H x D)0.9 x 4 x 2 in.Installationon 1.4-in. (35 mm) DIN rail, conforming to EN 60715 with lockSide by side mounting by means ofdouble slot and key connectionWiringspecific push-in connection