Honeywell ModBus S7810M, Installation Manual, Page: 8 / 24

S7810M MODBUS™ MODULE
65-0249—07 8
0084 40133 R7999 air position U16 0-4095
0085 40134 R7999 active fuel
position
U16 0-4095
0086 40135 R7999 FGR position U16 0-4095
0087 40136 R7999 fuel ID U16 0 = Fuel 1
1 = Fuel 2
0088-
0089
40137-
40138
R7999 cycles U32 0—1,000,000
Same as register 40410.
008A 40139 R7999 diagnostic bits. U16 Bit Meaning
15—LCO state
14—HFP state
13—LFP state
12—ALARM state
11—LCI state
10—HF state
9—MV state
8—LF state
7—LCO Relay Drive 2 feedback
6—LCO Relay Drive 1 feedback
5—LCM state
4—AUTO/MAN select
3—Selected Fuel
2—Fuel Select 2 Input
1—Fuel Select 1 Input
0—Hold State (Bit will be set On if Aux Input is in a hold condition or
disabled)
008B 40140 R7999 firing rate input U16 0-255 = 0-21.1 mA.
008C 40141 R7999 manual pot input U16 0-255 = 2.1-44.1 mA.
008D 40142 R7999 auxiliary input U16 0-255 = 0-21.1 mA.
008E 40143 Unused
008F 40144 R7999 Hold U16 Same as register 40139 bit 0
0090-
009E
40145-
40159
Unused
Table 12. ModBus™ R7999 Register Assignments.
Address
(hex) Register (dec) Parameter Name Bytes Notes
009F 40160 R7999 Message Counter Format—U16
Bits 0-2 = The Buffer Index of the oldest information from the
R7999. (Incremented by the BC status message once a
second.)
Bits 0-15 = A counter synchronized with R7999 messages.
00A0-00A5 40161-40166 R7999 buffer # 0 0-11 These buffers store an 8-second history of status data from
the R7999. The oldest buffer is indicated by register 40160,
bits 0-2. This scheme forms a circular buffer of information. A
buffer will contain all zeros if the S7810M received bad data
for the buffer time slot. See Table 25 for interpretation of
bytes 0-11.
00A6-00AB 40167-40172 R7999 buffer # 1 0-11
00AC-00B1 40173-40178 R7999 buffer # 2 0-11
00B2-00B7 40179-40184 R7999 buffer # 3 0-11
00B8-00BD 40185-40190 R7999 buffer # 4 0-11
00BE-00C3 40191-40196 R7999 buffer # 5 0-11
00C4-00C9 40197-40202 R7999 buffer # 6 0-11
00CA-00CF 40203-40208 R7999 buffer # 7 0-11
Table 11. ModBus™ R7999 Register Assignments. (Continued)
Address
(hex)
Register
(dec) Parameter Name Format Notes