CHAPTER 5: SETTINGS PRODUCT SETUPB90 LOW IMPEDANCE BUS DIFFERENTIAL SYSTEM – INSTRUCTION MANUAL 5-1235• DIRECT DEVICE 1 OFF to DIRECT DEVICE 16 OFF (direct device offline). These FlexLogic operands indicate that direct outputmessages from at least one direct device are not being received.Direct input and output settings are similar to remote input and output settings. The equivalent of the remote device namestrings for direct inputs and outputs is the DIRECT OUTPUT DEVICE ID setting, which identifies the relay in all direct outputmessages. All UR-series IEDs in a ring need to have unique numbers assigned. The IED ID is used to identify the sender ofthe direct input and output message.If the direct input and output scheme is configured to operate in a ring (DIRECT I/O CH1 RING CONFIGURATION or DIRECT I/OCH2 RING CONFIGURATION is “Yes”), all direct output messages are received back. If not, the direct input/output ring breakself-test is triggered. The self-test error is signaled by the DIRECT RING BREAK FlexLogic operand.Select the DIRECT I/O DATA RATE to match the data capabilities of the communications channel. All IEDs communicatingover direct inputs and outputs must be set to the same data rate. UR-series IEDs equipped with dual-channelcommunications cards apply the same data rate to both channels. Delivery time for direct input and output messages isapproximately 0.2 of a power system cycle at 128 kbps and 0.4 of a power system cycle at 64 kbps, per each "bridge."For B90 applications, the DIRECT I/O DATA RATE should be set to 128 kbps.Table 5-16: Direct input and output data ratesThe DIRECT I/O CHANNEL CROSSOVER setting applies to a B90 with dual-channel communication cards and allows crossingover messages from channel 1 to channel 2. This places all UR-series IEDs into one direct input and output networkregardless of the physical media of the two communication channels.The following application examples illustrate the basic concepts for direct input and output configuration. See the Inputsand Outputs section in this chapter for information on configuring FlexLogic operands (flags, bits) to be exchanged.Example 1: Extending the input/output capabilities of a UR-series relayConsider an application that requires additional quantities of contact inputs or output contacts or lines of programmablelogic that exceed the capabilities of a single UR-series chassis. The problem is solved by adding an extra UR-series IED,such as the C30, to satisfy the additional input and output and programmable logic requirements. The two IEDs areconnected via single-channel digital communication cards as shown in the figure.Module Supported data rates2A, 2B 64 kbps2E, 2F 64 kbps2G, 2H 128 kbps2I, 2J 64 kbps, 128 kbps72, 73 64 kbps, 128 kbps, 213 kbps74, 75 64 kbps76, 77 64 kbps7A, 7B, 7C, 7D 64 kbps, 128 kbps, 213 kbps7E, 7F, 7G 64 kbps7H, 7I, 7J, 7K 64 kbps, 128 kbps, 213 kbps7L, 7M, 7N, 7P, 7Q 64 kbps7R, 7S 64 kbps7T, 7W 64 kbpsThe G.703 modules are fixed at 64 kbps. The DIRECT I/O DATA RATE setting is not applicable to these modules.
