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S7810M MODBUS™ MODULE
65-0249—4
6
a
Remote Reset command not accepted by S7810M1029.
The register addresses in Table 11 are assigned to status information
received from the R7999. This information is interpreted by the
S7810M and placed in Registers 40130-40144. A circular buffer
scheme can be used to capture all R7999 status information at a
sampling frequency as low as one sample every eight seconds. Buffer
data updates once a second and holds the last eight seconds of
R7999 data to show a data history. The circular buffer is registers
40161-40256 in table 12.
0054
40085
BC Remote Command status.
R
U16
Bit 0: Autonomous.
Bit 1: Remote commanded off.
Bit 2: Remote commanded High fire.
Bit 3: Remote commanded low fire.
Bit 4: Remote reset has/will be sent to BC.
a
Bits 5-14: Unused.
Bit 15: Copied from the most recent write to the burner control
command.
0055
40086
BC Flame Amplifier type
R
U16
0 = Standard
1 = Unknown
2 = Amplicheck or missing amplifier
3 = Shutter
0056
40087
BC Purge Time
R
U16
Seconds
0057-
0065
40088-
40102
BC Diagnostics
R
U16
String codes indicating terminal/jumper state. See Table 16.
There are 15 codes. Not all are used for some burner controls.
0066-
007E
40103-
40127
Unused
007F
40128
BC Remote Command
W
U16
Only one bit in the LSByte must be set, with the exception of bit 15:
Bit 0 =Revert to autonomous operation.
Bit 1 = Don’t fire, remain off.
Bit 2 = Go to Hi Fire during Run.
Bit 3 = Go to Lo Fire during Run.
Bit 4 = Remote reset.
a
Bits 5-7 must be 0.
Bits 8-14 are ignored.
Bit 15: Copied to the control status register. The remote control status
register can be used to verify operation of the command.
NOTE:
Bits 1-3 must be refreshed at least every 120 seconds, but
not more than once a second, for the burner control to
remain in the commanded state.
Table 10. ModBus™ Register Assignments. (Continued)
Address
(hex)
Register
(dec)
Parameter Name
Read/
Write Format
Notes