1791-BIC

The 1791-BIC is a FLEX Ex bus isolator module manufactured by Allen-Bradley. The isolator has a thermal dissipation rating of 7.2 BTU per hour and it weighs 200 grams. The power dissipation rating for the 1791-BIC stands at 2.1 Watts while its output power is rated at 5.75 Volts DC. The isolator can accommodate 8 I/O modules. The 1791-BIC consumes a minimum voltage of 18 Volts DC and a maximum of 32 Volts DC at a current of 0.15 Amps. The power source failure rating for the 1791-BIC stands at 253 Volts AC. The FLEX Ex bus isolator is used to interconnect standard FLEX I/O modules to intrinsically safe FLEX Ex modules which are in the same I/O group.

The 1791-BIC, as with other FLEX Ex bus isolator modules, is meant to be mounted in an enclosure that will provide protection against specific environmental conditions and to protect the users from injury which may be brought by contact with electrically charged parts. Additionally, the enclosure should guard the 1791-BIC against unauthorized access. Note that the 1791-BIC is grounded through the DIN rail it is mounted on. Therefore, the DIN rail that is used must be Zinc plated with yellow-chromate steel for proper grounding. When wiring the 1791-BIC, a 12 gauge wire with a maximum insulation of 1.2 millimeters can be used. The module contains a LED indicator which lights up green when power is applied. When not in operation, the 1791-BIC can withstand a shock of 30 g for 11 +/-1 milliseconds and vibration of 5 g at a frequency of between 10 and 500 Hertz.