B-12
F650 DIGITAL BAY CONTROLLER
GEK-106310-AF
B.4 MODBUS DATA
APPENDIX B: MODBUS PROTOCOL
For example, to write to a mixed board (16 inputs and 8 outputs):
1 - OPEN OUTPUT FILE:
write to 0xFE20, 3 registers with the name
OUTPUT
2 - WRITE TO FILE:
write to 0xFF20, 5 REGISTERS, the first one is the board slot (F=0, G=1, H=2, J=3 and so on) and the
restraint ones are the bytes of bits (bits are grouped byte to byte).
3 - CLOSE OUTPUT FILE:
write msg to 0xFE 28 of 3 registers with the name
OUTPUT
Example, activate the two lower relays to board ‘0’:
1 Open:
[0xFE 0x10 0xFE 0x20 0x00 0x03 0x06 0x4F 0x55 0x54 0x50 0x55 0x54 0xA8 0x42]
---------> RELAY
O U T P U T
PC <---------
[0xFE 0x10 0xFE 0x20 0x00 0x03 0xA4 0x25]
2 Write:
[0xFE 0x10 0xFF 0x20 0x00 0x05 0x0A 0x00 0x00 0x03 0x00 0x00 0x00 0x00 0x00 0x00 0x00
0x0000 0x03
0xAE 0x8D]
---------> RELAY
PC <---------
[0xFE 0x10 0xFF 0x20 0x00 0x05 0x25 0xDB]
3 Close:
[0xFE 0x10 0xFE 0x28 0x00 0x03 0x06 0x4F 0x55 0x54 0x50 0x55 0x54 0x29 0xA8] ---------> RELAY
PC <---------
[0xFE 0x10 0xFE 0x28 0x00 0x03 0x25 0xE7]
B.4.6 Control events
This section explains control events, not to be confused with the snapshot events. A control event is the value change from
0 to 1 or from 1 to 0 of one bit, and is associated with a time label showing when the change occurred.
In the F650, any status or combination of status may generate an event. The F650 has
192 control events
available. The
first
128 control events
are user-configurable through a table from the EnerVista 650 Setup menu:
Setpoint > Relay
configuration
. The remaining
64 control events
are associated with the 16 possible switchgear, each one generating 4
status bits:
- Open (52B ON, 52A OFF)
- Close (52A ON, 52B OFF)
- Error 00 (52A&52B OFF)
- Error 11 (52A&52B ON)
Internally the events buffer is a circular FIFO of 255 events. The addresses for managing this FIFO are:
- 0x03FF:
Number of the next event
- 0xFCFF:
Access to the oldest event
- 0xFD00 to 0xFDFF:
Access to any stored event (circular queue)
The address
0x03FF
stores the number of the next event. For example, if the number 7677 is stored, the last event stored is
number 7676. This value is initially 0, and it is increases from 0 to 2^12 + 1 carry bit as events are generated.
Summary of Contents for F650
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