Abstract: A method for providing galvanic isolation between an input or trunk interface (30) and multiple outputs or spur interfaces (38) for connecting field devices (14) to a trunk (20) of a two-wire (44a, 44b) process control network (10) includes connecting multiple sets of multiple spur interfaces to respective isolating elements (34). Each isolating element (34) connects a respective set of outputs or spur interfaces (38) to the trunk interface (30) and galvanically isolates (40, 42) the respective set of spur interfaces (38) from the trunk interface (30). Field devices (14) attached to different sets of spur interfaces are also galvanically isolated from one another.

Abstract: A method for providing galvanic isolation between an input or trunk interface (30) and multiple outputs or spur interfaces (38) for connecting field devices (14) to a trunk (20) of a two-wire (44a, 44b) process control network (10) includes connecting multiple sets of multiple spur interfaces to respective isolating elements (34). Each isolating element (34) connects a respective set of outputs or spur interfaces (38) to the trunk interface (30) and galvanically isolates (40, 42) the respective set of spur interfaces (38) from the trunk interface (30). Field devices (14) attached to different sets of spur interfaces are also galvanically isolated from one another.

Abstract: A voltage limiting device for limiting the voltage being transferred from a trunk circuit to a spur circuit of a distributed control network includes an AC signal device that passes the AC data signals between the trunk circuit and the spur circuit.

Abstract: A voltage limiting device for limiting the voltage being transferred from a trunk circuit to a spur circuit of a distributed control network includes an AC signal device that passes the AC data signals between the trunk circuit and the spur circuit.

Abstract: A two-wire process input-output (“IO”) transmitter powered by a two-wire process loop and configured as a single transmitter. The transmitter including a gateway module and at least one local IO module. The gateway module including a first circuit configured to wholly power the gateway module from the two-wire process loop, a second circuit configured to communicate via the two-wire process loop, and a third circuit configured to communicate with the at least one IO module via a local bus separated from the two-wire process loop. The at least one local IO module including a first circuit configured to wholly power the respective local IO module from the two-wire process loop, a second circuit to communicate at least with the gateway module via the local bus, and a third circuit configured to interface with at least one IO field device.

Abstract: A modular system for transmitting power and data between a control processor that receives and transmits signals along a trunk of a distributed control network, and one or more field devices located in a hazardous area includes a backplane bus and a trunk module connected to the backplane and interconnecting the trunk and backplane. Intrinsically safe spur modules are removably attached to the backplane.

Abstract: A modular system for transmitting power and data between a control processor that receives and transmits signals along a trunk of a distributed control network, and one or more field devices located in a hazardous area includes a backplane bus and a trunk module connected to the backplane and interconnecting the trunk and backplane. Intrinsically safe spur modules are removably attached to the backplane.

Abstract: A two-wire process input-output (“IO”) transmitter powered by a two-wire process loop and configured as a single transmitter. The transmitter including a gateway module and at least one local IO module. The gateway module including a first circuit configured to wholly power the gateway module from the two-wire process loop, a second circuit configured to communicate via the two-wire process loop, and a third circuit configured to communicate with the at least one IO module via a local bus separated from the two-wire process loop. The at least one local IO module including a first circuit configured to wholly power the respective local IO module from the two-wire process loop, a second circuit to communicate at least with the gateway module via the local bus, and a third circuit configured to interface with at least one IO field device.

Abstract: A modular system for transmitting power and data between a control processor that receives and transmits signals along a trunk of a distributed control network, and one or more field devices located in a hazardous area includes a backplane bus and a trunk module connected to the backplane and interconnecting the trunk and backplane. Intrinsically safe spur modules are removably attached to the backplane.