Direct Input And Output Communications; Description - GE C30 Instruction Manual

DIRECT INPUT AND OUTPUT COMMUNICATIONS

CHAPTER 3: INSTALLATION
Figure 3-22: Options for the IRIG-B connection
3
Using an amplitude-modulated receiver causes errors up to 1 ms in event time-stamping.
NOTE
3.4 Direct input and output communications

3.4.1 Description

The direct inputs and outputs feature makes use of the type 7 series of communications modules, which allow direct
messaging between UR devices. These communications modules are outlined in the table later in this section.
The communications channels are normally connected in a ring configuration, as shown in the following figure. The
transmitter of one module is connected to the receiver of the next module. The transmitter of this second module is then
connected to the receiver of the next module in the ring. This is continued to form a communications ring. The figure
illustrates a ring of four UR-series relays with the following connections: UR1-Tx to UR2-Rx, UR2-Tx to UR3-Rx, UR3-Tx to
UR4-Rx, and UR4-Tx to UR1-Rx. A maximum of 16 UR-series relays can be connected in a single ring.
3-24 C30 CONTROLLER SYSTEM – INSTRUCTION MANUAL