D.5
Date Code 20110408 Instruction Manual SEL-551 Relay
Configuration, Fast Meter, and Fast Operate Commands
Message Definitions
A5D2/A5D3 Demand/
Peak Demand Fast
Meter Message
In response to the A5D2 or A5D3 request, the relay sends the following block:
A5B9 Fast Meter
Status Acknowledge
Message
In response to the A5B9 request, the relay clears the Fast Meter (message
A5D1) Status Byte. The SEL-551 Status Byte contains one active bit, STSET
(bit 4). The bit is set on power up and on settings changes. If the STSET bit is
set, the external device should request the A5C1, A5C2, and A5C3 messages.
The external device can then determine if the scale factors or line
configuration parameters have been modified.
0000
Scale factor offset in Fast Meter message
494E00000000
Analog channel name (IN)
02
Analog channel type
FF
Scale factor type
0000
Second scale factor offset in Fast Meter message
494700000000
Analog channel name (IG)
02
Analog channel type
FF
Scale factor type
0000
Scale factor offset in Fast Meter message
334932000000
Analog channel name (3I2)
02
Analog channel type
FF
Scale factor type
0000
Scale factor offset in Fast Meter message
00
Reserved
checksum
Table D.6 A5C2/A5C3 Demand/Peak Demand Fast Meter Configuration
Messages (Sheet 2 of 2)
Data Description
Table D.7 A5D2/A5D3 Demand/Peak Demand Fast Meter Message
Data Description
A5D2 or A5D3 Command
3E Length
1-byte 1 Status Byte
48-bytes Demand IA, IB, IC, IN, IG, 3I2 in 8-byte IEEE FPS
8-bytes Time stamp
1-byte reserved
1-byte 1-byte checksum of all preceding
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