Direct Inputs And Outputs - GE B90 UR Series Instruction Manual

5 SETTINGS
Direct inputs and outputs are intended for exchange of status information (inputs and outputs) between UR-series relays
connected directly via type 7 digital communications cards. The mechanism is very similar to IEC 61850 GSSE, except that
communications takes place over a non-switchable isolated network and is optimized for speed. On type 7 cards that sup-
port two channels, direct output messages are sent from both channels simultaneously. This effectively sends direct output
messages both ways around a ring configuration. On type 7 cards that support one channel, direct output messages are
sent only in one direction. Messages will be resent (forwarded) when it is determined that the message did not originate at
the receiver.
Direct output message timing is similar to GSSE message timing. Integrity messages (with no state changes) are sent at
least every 1000 ms. Messages with state changes are sent within the main pass scanning the inputs and asserting the
outputs unless the communication channel bandwidth has been exceeded. Two self-tests are performed and signaled by
the following FlexLogic operands:
1. (direct input/output ring break). This FlexLogic operand indicates that direct output messages
DIRECT RING BREAK
sent from a UR-series relay are not being received back by the relay.
2.
DIRECT DEVICE 1 OFF to DIRECT DEVICE 16 OFF
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
relay in all direct output messages. All UR-series IEDs in a ring should 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 (
is "Yes"), all direct output messages should be received back. If not, the direct input/output ring
CH2 RING CONFIGURATION
break self-test is triggered. The self-test error is signaled by the
Select the
DIRECT I/O DATA RATE
over direct inputs and outputs must be set to the same data rate. UR-series IEDs equipped with dual-channel communica-
tions 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
GE Multilin
(direct device offline). These FlexLogic operands indicate that direct
DIRECT OUTPUT DEVICE ID
to match the data capabilities of the communications channel. All IEDs communicating
should be set to 128 kbps.
B90 Low Impedance Bus Differential System
. The
DIRECT OUTPUT DEVICE ID
DIRECT I/O CH1 RING CONFIGURATION
FlexLogic operand.
DIRECT RING BREAK
5.2 PRODUCT SETUP
setting identifies the
or
DIRECT I/O
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