CHAPTER 5: SETTINGS PRODUCT SETUP
B90 LOW IMPEDANCE BUS DIFFERENTIAL SYSTEM – INSTRUCTION MANUAL 5-123
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• DIRECT DEVICE 1 OFF to DIRECT DEVICE 16 OFF (direct device offline). These FlexLogic operands indicate that direct output
messages 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 name
strings for direct inputs and outputs is the
DIRECT OUTPUT DEVICE ID setting, which identifies the relay in all direct output
messages. All UR-series IEDs in a ring need to have unique numbers assigned. The IED ID is used to identify the sender of
the 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/O
CH2 RING CONFIGURATION
is “Yes”), all direct output messages are received back. If not, the direct input/output ring break
self-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 communicating
over direct inputs and outputs must be set to the same data rate. UR-series IEDs equipped with dual-channel
communications cards apply the same data rate to both channels. Delivery time for direct input and output messages is
approximately 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 rates
The
DIRECT I/O CHANNEL CROSSOVER setting applies to a B90 with dual-channel communication cards and allows crossing
over messages from channel 1 to channel 2. This places all UR-series IEDs into one direct input and output network
regardless 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 Inputs
and 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 relay
Consider an application that requires additional quantities of contact inputs or output contacts or lines of programmable
logic 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 are
connected via single-channel digital communication cards as shown in the figure.
Module Supported data rates
2A, 2B 64 kbps
2E, 2F 64 kbps
2G, 2H 128 kbps
2I, 2J 64 kbps, 128 kbps
72, 73 64 kbps, 128 kbps, 213 kbps
74, 75 64 kbps
76, 77 64 kbps
7A, 7B, 7C, 7D 64 kbps, 128 kbps, 213 kbps
7E, 7F, 7G 64 kbps
7H, 7I, 7J, 7K 64 kbps, 128 kbps, 213 kbps
7L, 7M, 7N, 7P, 7Q 64 kbps
7R, 7S 64 kbps
7T, 7W 64 kbps
The G.703 modules are fixed at 64 kbps. The DIRECT I/O DATA RATE setting is not applicable to these modules.
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