The system bus terminal block is a blue, removable, 4-terminal plug that fits into a board-mounted jack. Wire the removable system bus terminal block plugs on the controller that is on the top row of the stacked connector. Wire the other field controllers in a daisy-chain configuration using 3-wire twisted, shielded cable as shown in Figure 1. See Table 1 for more information on functions, ratings, requirements and cables.
Figure 1. System Bus Terminal Block Wiring
Note: The System Bus Shield (SHD) terminal is isolated and you can use it to connect the shields, in a daisy-chain configuration, for system bus wiring.