Honeywell ModBus S7810M User manual

PRODUCT DATA
65-0249-4
® U.S. Registered Trademark
Copyright © 2002 Honeywell • All Rights Reserved
*
*S7810M1029 ONLY
S7810M
ModBus™ Module
APPLICATION
The Honeywell 7800 SERIES is a microprocessor-based
integrated burner control for automatically fired gas, oil or
combination fuel single-burner applications. The 7800
SERIES is programmed to provide a level of safety, functional
capability and features beyond the capacity of conventional
controls. Functions provided by the 7800 SERIES include
automatic burner sequencing, flame supervision, system
status indication, system or self-diagnostics and
troubleshooting.
The S7810M ModBus™ Module supports remote mounting of
a Keyboard Display Module (KDM), personal computer/PLC
interface for multi-dropped 7800 SERIES subnetworks, and
remote reset of a 7800 SERIES Relay Module.
FEATURES
• Multi-dropped communications bus interface.
• Remote control capabilities:
— Standby Hold
— Drive to High Fire
— Drive to Low Fire
— Reset
• Ability to remotely mount a Keyboard Display Module.
• S7810M1029 meets Gastec approval (cannot be reset
through data highway).
SPECIFICATIONS
Model: S7810M ModBus™ Module.
Electrical Ratings:
Voltage and Frequency:
13 Vdc peak full-wave rectified (+20/-15%)
Power Dissipation:
2W maximum.
Terminal Ratings:
Power: 13 Vdc peak full-wave rectified.
Earth ground.
ControlBus™ (1,2,3) and Multi-Drop ModBus™ (6,7,8):
5 Vdc at 60 mA maximum.
Electrical Connector (included):
ControlBus™: 208727 8-pin electrical connector.
Environmental Ratings:
Ambient Temperature:
Operating: -40°F to +140°F (-40°C to +60°C).
Storage: -40°F to +150°F (-40°C to +66°C).
Humidity: 85% relative humidity, continuous, noncondensing.
Vibration: 0.5G environment.
Weight: 4 ounces.
Replacement Part: 208727 eight-pin connector.
Approvals: S7810M1029: Gastec EN268, Report 1156791.
Dimensions: See Fig. 1.

S7810M MODBUS™ MODULE
65-0249—4 2
ORDERING INFORMATION
When purchasing replacement and modernization products from your TRADELINE® wholesaler or distributor, refer to the
TRADELINE® Catalog or price sheets for complete ordering number.
If you have additional questions, need further information, or would like to comment on our products or services, please write or
phone:
1. Your local Home and Building Control Sales Office (check white pages of your phone directory).
2. Home and Building Control Customer Relations
Honeywell, 1885 Douglas Drive North
Minneapolis, Minnesota 55422-4386
In Canada—Honeywell Limited/Honeywell Limitée, 35 Dynamic Drive, Scarborough, Ontario M1V 4Z9.
International Sales and Service Offices in all principal cities of the world. Manufacturing in Australia, Canada, Finland, France,
Germany, Japan, Mexico, Netherlands, Spain, Taiwan, United Kingdom, U.S.A.
Fig. 1. Mounting dimensions of
S7810M ModBus™Module in in. (mm).
INSTALLATION
When Installing this Product...
1. Read these instructions carefully. Failure to follow them could
damage the product or cause a hazardous condition.
2. Check the ratings given in the instructions and marked on the
product to make sure the product is suitable for your
application.
3. The installer must be a trained, experienced flame safeguard
technician.
4. Disconnect the power supply before beginning installation to
prevent electrical shock and equipment damage. More than
one power supply disconnect can be required.
5. Wiring must comply with all applicable codes, ordinances and
regulations.
6. After installation is complete, check out product operation as
provided in these instructions.
IMPORTANT:
This equipment can cause interference with radio com-
munications.
This equipment generates, uses, and can radiate radio
frequency energy, and if not installed and used in
accordance with the Instructions Manual, may cause
interference with radio communications. It has been tested
and found to comply with the limits for a Class B computing
device pursuant to Subpart J of Part 15 of FCC Rules,
which are designed to provide reasonable protection
against such interference when operated in a commercial
environment. Operation of this equipment in a residential
area is likely to cause interference, in which case, users, at
their own expense, will be required to take whatever
measures may be required to correct the interference. Any
unauthorized modification of this equipment may result in
the revocation of the owner’s authority to continue its
operation. When operating the S7810M remotely with a
separate power supply, FCC compliance is not guaranteed
unless an FCC-approved power supply is used.
Canadian EMI: This digital apparatus does not exceed the Class B
limits for radio noise emission from digital apparatus set out in the
Radio Interference Regulations of the Canadian Department of
Communications.
Le présent appareil numérique n’émet pas de bruits radioélectriques
depassant les limites applicables aux appareils numériques de la
Classe B prescrites dans le Règlement sur le brouillage
radioélectrique édicté par le ministère des Communications du
Canada.
Humidity
Install the S7810M where the relative humidity never reaches the
saturation point. The S7810M is designed to operate in a maximum
humidity environment of 85 percent relative humidity, continuous,
noncondensing moisture.
Weather
The S7810M is not designed to be weather-tight. When installed
outdoors, protect the S7810M with an approved weather-tight
enclosure.
Vibration
Do not install the S7810M where it could be subjected to vibration in
excess of 0.5G continuous maximum vibration.
Mounting the S7810M ModBus™ Module (Fig. 2).
1. Align the two ears of the ModBus™ Data ControlBus™ Module
with the two mating slots on the 7800 SERIES Relay Module.
2. Insert the two interlocking ears into the two mating slots
and, with a hinge action, push on the lower corners of the
ModBus™ Data ControlBus™ Module to secure it to the
7800 SERIES Relay Module.
Fig. 2. ModBus™ Module mounting.
M
11349A
BURNER CONTROL
2-3/4
(69)
29/32 (23)
5/32
(4)
4-27/32 (123)
1-1/8 (29)
7/16 (11)
MODE

S7810M MODBUS™ MODULE
3 65-0249—4
Fig. 3. Wiring S7810M ModBus™ Module.
Wiring (Fig. 3)
1. Refer to Fig. 3 for proper wiring.
2. All wiring must comply with all applicable electrical codes,
ordinances and regulations.
3. Recommended wiring size and type:
a. For all communications, use 22 AWG, 3-wire shielded
cable (Belden part number 8723 or equivalent).
b. For 13 Vdc and remote reset switch operation,
use 22 AWG wire insulated for voltages and temperatures
in the application. Suggested wire types included
TW (60°C), THW (75°C) and THHN (90°C). Terminal
identification numbers and letters are shown in Table 1.
4. Wire routing:
a. Do not route the communication cable in conduit with
line voltage circuits.
b. Do not route the communication cable close to the
ignition transformers.
c. Route the communication cable outside of conduit if
properly supported and protected from damage.
d. Route the communication cable so that all devices are
connected in a daisy chain configuration.
See Fig. 3.
5. Maximum wire lengths:
a. Communications bus, 4000 feet (1219 meters).
b. Remote reset switch, 1000 feet (305 meters).
RS485
BUS
ABC
M17616B
MULTI-DROP RS-485 COMMUNICATION BUS.UP TO 31 S7810M MODBUS™ MODULES CAN BE CONNECTEDTO A SINGLE BUS WITHOUT AN
RS-485 REPEATER. UPTO 99 S7810M MODBUS™ MODULES (SUBNETWORKS) CAN BE CONNECTED TO A BUSWITH RS-485 REPEATERS.WHEN
USING AN RS-485 REPEATER, THE REPEATER MUST BE INSTALLED EVERY 30TH MODULE.
THE SUBNETWORKS MUST BE WIRED IN A DAISY CHAIN CONFIGURATION. RECOMMEND THAT THE PC/PLC BE AT ONE END OF THE DAISY CHAIN
.
MODBUS™ COMMUNICATION BUS TERMINATION RESISTORS:
1
2
3
4
5
6
6
6
2
5
5
5
5
5
5
3
3
3
3
2
2
1
14
4
8 7 6 5 4 3 2 1
S7810M MODBUS™
MODULE
S7810M MODBUS™
MODULE S7810M MODBUS™
MODULE
7800 SERIES
RELAY MODULE
8 7 6 5 4 3 2 1
7800 SERIES
RELAY MODULE
8 7 6 5 4 3 2 1
7800 SERIES
RELAY MODULE
INPUT
OUTPUT
+–
GND
+–
GND
1 2 3 4 5 A B C
MOMENTARY
PUSHBUTTON
SWITCH
S7800 REMOTE
KEYBOARD
DISPLAY
MODULE
S7830
EXPANDED
ANNUNCIATOR
A B C
R7999
CONTROLINKS™
CONTROLLER
RS-485
REPEATER
A. WITHOUT RS-485 REPEATER:
LOCAL RS-485 COMMUNICATION BUS.THE DEVICES ONTHIS BUS MUST BE WIRED IN A DAISY CHAIN CONFIGURATION.THE ORDER OF
INTERCONNECTION IS NOT IMPORTANT.THE MODULES ONTHE CLOSEST AND FARTHEST ENDS OF THE DAISY CHAIN REQUIRE A
120 OHM 1/4 WATT TERMINATION RESISTOR BETWEENTERMINALS 1 AND 2 OR A AND B.
RECOMMEND THREE-WIRE SHIELDED CABLE (BELDEN 8723 SHIELDED OR EQUIVALENT). CABLE SHIELD MUSTTERMINATE TO EARTH
GROUND AT BOTH ENDS OF CABLE.
THE MODBUS™ BUS COMMON, S7810M MODBUS™TERMINAL 6, AND THE LOCAL BUS COMMON (S7810M MODBUS™ TERMINAL 3) MUST NOT
BE ELECTRICALLY CONNECTED TOGETHER.
MODULES AT THE CLOSEST AND FARTHEST END OF THE DAISY CHAIN REQUIRETERMINATION
RESISTORS. INSTALL A 120 OHM, 1/4WATT RESISTOR BETWEENTERMINALS A AND B OFTHE PC/PLC.(IF INSTALLED AT ONE END
OF DAISY CHAIN).INSTALL A 120 OHM, 1/4 WATT RESISTOR BETWEENTERMINALS A AND B OF THE PC/PLC (IF INSTALLED AT ONE END OF
THE DAISY CHAIN. INSTALL A 120 OHM, 1/4 WATT RESISTOR BETWEENTERMINALS 7 AND 8 OF THE LAST S7810M MODBUS™ MODULE
IN THE DAISY CHAIN.
WHEN AN RS-485 REPEATER IS USED,TWO DAISY CHAIN CONFIGURATIONS ARE EFFECTIVELY FORMED.
MODULES AT THE CLOSEST AND FARTHEST END OF EACH DAISY CHAIN REQUIRE TERMINATION RESISTORS. INSTALL A 120 OHM, 1/4 WATT
RESISTOR BETWEENTERMINALS A AND B OFTHE PC/PLC.(IF INSTALLED AT ONE END OF DAISY CHAIN).INSTALL A 120 OHM,
1/4 WATT RESISTOR BETWEEN INPUTTERMINALS DATA+ AND DATA- OF THE RS-485 REPEATER. INSTALL A 120 OHM, 1/4 WATT RESISTOR
BETWEEN TERMINALS 7 AND 8 OF THE LAST S7810M MODBUS™ MODULE INTHE ADDITIONAL DAISY CHAINS.
B. WITH RS-485 REPEATER:
PC/PLC
7TERMINAL NUMBERS ARE ON 203541 5-WIRE CONNECTOR (SUPPLIEDWITH REMOTE MOUNTING BRACKET).
7

S7810M MODBUS™ MODULE
65-0249—4 4
Table 1. S7810M Terminal Identification.
MODE LED Light Patterns
Table 2 explains the MODE LED light patterns.
Table 2. Explanation of MODE LED light patterns.
OPERATION
The S7810M ModBus™ Data ControlBus™ Module has two
communications ports. The ControlBus™ communications port allows
communications on a bus that contains a 7800 SERIES burner
controller and an S7800 Keyboard Display Module and/or an S7830
Expanded Annunciator and/or an R7999 ControLinks™ Controller.
A second communications port supports RS-485 communications
using ModBusTM protocol. The following tables provide ModBus™
mapping information.
Table 10 provides register mapping. It identifies the mapping of the
7800 SERIES parameters to ModBus™ registers. These codes are
transmitted by the relay modules and the S7830 Expanded
Annunciator.
Function Codes
Supported function codes of Modbus Protocol Reference Guide
(PI-MBUS-300 Rev. J) are 3, 4, 6, and 17. Function codes 3 and 4
are treated the same by the S7810M. Two registers need to be read
when the data format is a U32 value (4 bytes); if both registers are
not read, then a data value of 0 (zero) is returned. U32 values are in
little endian format. The maximum number of addresses that can be
queried is 127 (0x7F) for each query message.
Tables 3 through 7 provide information on the function codes.
NOTE: All Query and Response cells below are 1 byte.
Table 3. Query Message Format for Function Codes 3 and 4.
Table 4. Response Message Format for Function Codes 3 and 4.
Table 5. Query Message Format for Function Code 6 (Broadcast is supported by using a slave address of 00).
Table 6. Response Message Format for Function Code 6 (There is no response if the query was broadcast.)
Table 7. Query Message Format for Function Code 17.
NOTE: See Table 20 for function code 17 response format.
Table 8. Exception Response Message Format.
Signal S7810M Terminal
ControlBus™ Data + 1
ControlBus™ Data - 2
Common
•ControlBus™ Common
•+13 Vdc Common
•Remote Reset Common
3
+13 Vdc 4
Remote Reset 5
ModBus™ Common 6
ModBus™ Data + 7
ModBus™ Data - 8
LED Code/
Behavior Pulse Period Interval Meaning
Always OFF OFF Not powered or device
failure.
Always ON ON S7810M device failure.
Mostly ON
with 1 blink
50 ms (OFF) 1
second
Both ControlBus™ and
Modbus are active
Mostly OFF
with 1 flash
50 ms (ON) 3.85
seconds
ControlBus™ is active,
and Modbus is not active.
Mostly OFF
with 2 pulses
2 x (200 ms ON,
200 ms OFF)
1.75
seconds
Program CRC error.
Mostly OFF
with 3 pulses
3 x (200 ms ON,
200 ms OFF)
2.15
seconds
No ControlBus™ signal
from the Burner Control
Slave Address Function Code
Starting
Address High
Starting
Address Low
Number of
Addresses High
Number of
Addresses Low CRC CRC
01 03 00 0A 00 01 A4 08
Slave Address Function Code Byte Count Data High Data Low CRC CRC
01 03 02 00 22 38 5D
Slave Address Function Code
Starting
Address High
Starting
Address Low
Preset Data
High
Preset Data
Low CRC CRC
01 06 00 7F 00 04 B9 D1
Slave Address Function Code
Starting
Address High
Starting
Address Low
Preset Data
High
Preset Data
Low CRC CRC
01 06 00 7F 00 04 B9 D1
Slave Address Function Code CRC CRC
03 11 C1 4C
Slave
Address
Function
Code
+ 80h
Exception
Code
CRC CRC

S7810M MODBUS™ MODULE
5 65-0249—4
Table 9. Exception Codes.
Device Address and Baud Rate
Assign each S7810M in the system a unique address by setting the
MODBUS ADDRESS switches on the bottom of the device to the
correct number. See Fig. 4. Only RTU communications with 1 Start
Bit, 8 Data Bits, 1 Stop Bit and no parity is supported.
NOTE: Assign a device address number from 01 to 99. 00 is not an
acceptable address number and will not work, except for
the broadcast ability of function 6.
The default baud rate is 9600. To change the baud rate to 19.2K,
use a needle-nosed pliers to remove the jumper.
IMPORTANT:
FlameNet™ requires a baud rate of 19.2K.
NOTE: In Tables 10, 15 and 19: Line 1 and Line 2 refer to the
two lines of text on the S7800 Keyboard Display Module.
In Tables 15, 17 and 19: The String Code column
references Table 66, String Codes.
In Table 15: The Burner Control State Bits column
references Table 22, Burner Control State Bits. “cb_sqst”
is the Burner Control Sequence Status.
Fig. 4. S7810M Address Switches and Baud Rate Jumper.
Exception
Code Definition Description
01 Illegal
Function
An illegal function as requested. Only 3, 4, 6
and 17 are supported.
02 Illegal Data
Address
Too many bytes requested, address is out of
range, register is read only, or the number of
address requested is past the last register.
03 Illegal Data
Value
The “Preset Data” from function code 6 is
invalid/out of range.
3
4
2
1
5
8
9
7
6
0
3
4
2
1
5
8
9
7
6
0
10'S 1'S BAUD
RATE
MODBUS
ADDRESS OUT
19.2K
IN
9600
5
6
7
3
4
2
1
8
9
0
SCREWDRIVER NEEDLENOSE
PLIERS
M17650
Table 10. ModBus™ Register Assignments.
Address
(hex)
Register
(dec) Parameter Name
Read/
Write Format Notes
0000 40001 Burner Control (BC) Fault Code R U16 See Table 17.
0001 40002 BC Fault String Code R U16 See Table 16.
0002 40003 BC Sequence State R U16 See Table 15 (valid only if Fault code = 0).
0003 40004 BC State String Code (line 1) R U16 See Table 16.
0004 40005 BC State String Code (line 2) R U16 See Table 16.
0005 40006 BC Sequence time R U16 0-4095 Seconds.
0006 40007 BC Total cycles R U32 Max value is 0xFFFFFFFF.
0008 40008 BC Total hours R U32 Max value is 0xFFFFFFFF.
000A 40011 BC Flame 1 signal strength R U16 0 to 255 represents 0.0 to 25.5 volts.
000B 40012 BC Flame 2 signal strength R U16 0 to 4095. N/A for 7800 SERIES.
000C 40013 BC State Bits R U16 See Table 22.
000D 40014 S7830 First Out Code R U16 See Table 19.
000E 40015 S7830 State Bits R U32 Bit 31 (MSB) to Bit 0 (LSB) represent Terminals T31 to T0 of
the Expanded Annunciator. Only T4-T22 are used.
0010-
0019
40017-
40026
BC Fault history record 1 R Newest fault record. See Table 18.
001A-
0023
40027-
40036
BC Fault history record 2 R Second newest fault record. See table 18.
0024-
002D
40037-
40046
BC Fault history record 3 R Third newest fault record. See Table 18.
002E-
0037
40047-
40056
BC Fault history record 4 R Fourth newest fault record. See Table 18.
0038-
0041
40057-
40066
BC Fault history record 5 R Fifth newest fault record. See Table 18.
0042-
004B
40067-
40076
BC Fault history record 6 R Oldest fault record. See Table 18.
004C 40077 BC Flame Failure Response Time R U16 Tenths of Seconds.
004D 40078 BC Manufacturing code R U32
004F 40080 BC Type Code R U16 See Table 21.
0050 40081 BC Software version R U32
0052 40083 EA Software version R U32

S7810M MODBUS™ MODULE
65-0249—4 6
aRemote 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

S7810M MODBUS™ MODULE
7 65-0249—4
Table 11. ModBus™ R7999 Register Assignments.
Address
(hex)
Register
(dec) Parameter Name 0x0C Format Notes
0080 40129 R7999 reserved U16 Not used—always zero.
0081 40130 R7999 program mode 3 U16 0—Initiate State.
1—Normal Operation.
2—Alarm Initiate State.
3—Lockout.
4—Not Configured.
5—Factory Test.
6—Low Voltage.
7—Commissioning.
8—Reset.
0082 40131 R7999 fault code 4 U16 See Table 26.
0083 40132 R7999 operational status 5 U16 00—Standby Hold.
01—Standby Stop Position.
02—Standby Main Valve.
03—Standby Low Fire Main Valve.
04—Standby Purge.
05—Fault 1.
06—Standby Hi Fire Main Valve.
07—Fault 2.
08—Processing Demand.
09—Light Off.
10—Modulate.
11—Light Off Low Fire Main Valve.
12—Purge.
13—Fault 3.
14—Purge Main Valve.
15—Fault 4.
16—Initialize.
17—Post Purge.
0084 40133 R7999 air position 6-7 U16 0-4095
0085 40134 R7999 active fuel position 8-9 U16 0-4095
0086 40135 R7999 fgr position 10-11 U16 0-4095
0087 40136 R7999 fuel id 3.7 U16 0 = Fuel 1
1 = Fuel 2
0088-
0089
40137-
40138
R7999 cycles 10-13 U32
008A 40139 R7999 diagnostic bits. 6, 8,
10, 12
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
008B 40140 R7999 firing rate input 12 U16 0-255 = 0-21.1 mA.
008C 40141 R7999 manual pot input 13 U16 0-255 = 2.1-44.1 mA.
008D 40142 R7999 auxiliary input 14 U16 0-255 = 0-21.1 mA.
008E 40143 Unused
008F 40144 R7999 Hold 3,4 U16 Same as register 40139 bit 0
0090-
009E
40145-
40159
Unused

S7810M MODBUS™ MODULE
65-0249—4 8
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
40209-
40220
R7999 buffer # 4 0-11
00BE-
00C3
40221-
40232
R7999 buffer # 5 0-11
00C4-
00C9
40233-
40244
R7999 buffer # 6 0-11
00CA-
00CF
40245-
40256
R7999 buffer # 7 0-11
Table 13. ModBus™ R7999 Register Assignments.
Address
(hex)
Register
(dec) Parameter Name Format Notes
00D0-
015F
40209-
40352
R7999 Profile See Table 23.
0160 40353 Fuel 1 closed endpoint U16 0-4095
0161 40354 Fuel 1 open endpoint U16 0-4095
0162 40355 Fuel 2 closed endpoint U16 0-4095
0163 40356 Fuel 2 open endpoint U16 0-4095
0164 40357 Inactive motor position U16 0-4095
0165 40358 Registers 40353-40357 are current U16 0-1
0166 40359 Air closed endpoint position U16 0-4095
0167 40360 Air open endpoint position U16 0-4095
0168 40361 FGR closed endpoint position U16 0-4095
0169 40362 FGR open endpoint position U16 0-4095
016A 40363 Unused U16
016B 40364 Registers 40359-40363 are current U16 0-1
016C-
018F
40365-
40400
R7999 Fault Information Ref. Table 24.
0190 40401 Air Total Resistance U16 0-4095. Air actuator feedback pot resistance.
0191 40402 Fuel 1 Total Resistance U16 0-4095. Fuel 1 actuator feedback pot resistance.
0192 40403 Fuel 2 Total Resistance U16 0-4095. Fuel 2 actuator feedback pot resistance.
0193 40404 FGR Total Resistance U16 0-4095. FGR actuator feedback pot resistance.
0194 40405 Air Resistance Change U16 0-4095. Bit 15 is a sign flag. 1 = negative, 0 = positive.
0195 40406 Registers 40401-40405 are current U16 0-1
0196 40407 Fuel 1 Resistance Change U16 0-4095. Bit 15 is a sign flag. 1 = negative, 0 = positive.
0197 40408 Fuel 2 Resistance Change U16 0-4095. Bit 15 is a sign flag. 1 = negative, 0 = positive.
0198 40409 FGR Resistance Change U16 0-4095. Bit 15 is a sign flag. 1 = negative, 0 = positive.
0199 40410-
40411
LCO Cycle Count U32 0-1,000,000
019B 40412 Registers 40407-40411 are current U16 0-1
019C 40413 Air Purge Preset Position U16 0-4095
019D 40414 Fuel Purge Preset Position U16 0-4095

S7810M MODBUS™ MODULE
9 65-0249—4
019E 40415 FGR Purge Preset Position U16 0-4095
019F 40416 Air Lightoff Preset Position U16 0-4095
01A0 40417 Fuel Lightoff Preset Position U16 0-4095
01A1 40418 Registers 40413-40417 are current U16 0-1
01A2 40419 Lightoff Preset FGR U16 0-4095
01A3 40420 Air Standby Position U16 0-4095
01A4 40421 Fuel Standby Position U16 0-4095
01A5 40422 FGR Standby Position U16 0-4095
01A6 40423 Non-Selected Fuel Standby Position U16 0-4095
01A7 40424 Registers 40419-40423 are current U16 0-1
01A8 40425 Number of Profile Points U16H 0-23
Major Software Revision U16L
01A9 40426 Minor Software Revision U16H
Software Version Code U16L
01AA 40427 R7999 ControlBus™ revision U16H Bits 0-3 FlameNet™ and R7999 display.
R7999 Compatibility Code for ZM7999 U16L
01AB 40428 R7999 Software Build Code U16 0x0000-0xFFFF
01AC 40429 Abort Code U16H 0-255
Abort Code Count U16L 0-255
01AD 40430 Registers 40425-40429 are current U16 0-1
01AE 40431 Low Fire Hold Configuration U16H 0—Disabled (Not configured)
1—Low Fire Hold (Position the FGR, Air and Fuel actuators at the
Light Off Position).
2—Modulate with FGR closed (FGR closed, Air and fuel
modulating).
3—Low Fire Hold with FGR closed (FGR closed, Air and Fuel at
Light Off Position).
Configuration Options U16L If a Bit = 1, then the option is configured.
Bit 0: FGR is set to follow the profile (curve) during purge.
Bit 1: Maximum Firing rate is controlled by the Manual Firing Rate
input.
Bits 2-15: Unused.
01AF 40432 Min Auxiliary Temperature U16 0x0000-0xFFFF. Subtract 40 to get the actual value.
01B0 40433 Max Auxiliary Temperature U16 0x0000-0xFFFF. Subtract 40 to get the actual value.
01B1 40434 Auxiliary Release Temperature Counts U16 Release the Low Fire Hold condition and allow Modulation after the
Aux. temperature reaches this temperature or higher. See Note 5.
01B2 40435 Auxiliary Enforce Temperature Counts U16 Initiate a Hold condition when the Aux. temperature reaches this
temperature or lower. See Note 5.
01B3 40436 Registers 40431-40435 are current U16 0-1
01B4-
01B5
40437-
40438
Running Time in Hours U32
01B6 40439 Running Time in Minutes U16H
Unused U16L
Table 13. ModBus™ R7999 Register Assignments. (Continued)
Address
(hex)
Register
(dec) Parameter Name Format Notes

S7810M MODBUS™ MODULE
65-0249—4 10
NOTES:
1. Due to the amount of data provided by the R7999, some registers contain two parameters, one in the Data Hi byte and one in the Data Lo byte.
Using Register 40429 as an example: The format for “Abort Code” is “U16H”, meaning the Data Hi byte is the parameter’s value, and for “Abort
Code Count”, with a format of “U16L”, the Data Lo byte is the parameter’s value. So a query of 01 03 01 AC 00 01 might result in a response of
01 03 00 02 05 10 which means “Abort Code = 5” and “Abort Code Count = 0x10”. Each parameter value is a byte.
2. Parameter values in this table change infrequently and can take up to 39 seconds for all data to be available, except for registers 40443
through 40444, which are updated twice a second.
3. “Device Data Ready” and “S7810M Compatibility” bits can be used to quickly check device availability and compatibility then read/write regis-
ters of only these devices.
4. If “Device Data Ready” is true for the R7999, then all “Registers nnnnn-nnnnn are current” are true. If “Device Data Ready” is false for the
R7999, then one or more of the “Registers nnnnn-nnnnn are current” flags are false. This is used to verify that the R7999 parameter values
were received when expected. Otherwise, the values for the register range could be greater than 40 seconds old.
5. R7999 Auxiliary Temperature data: Release Temperature, Enforce Temperature and Auxiliary Input Temperature need to be calculated. use
the following conversion formulas:
a. m= ((MaxAuxTmp) - (MinAuxTmp))/3108.
b. b= MinAuxTmp - (m * 777).
c. Release Temperature = (m* ReleaseTemperatureCounts) + b.
d. Enforce Temperature = (m* EnforceTemperatureCounts) + b.
e. mAux = 193.37/(MaxAuxTmp - MinAuxTmp).
f. bAux = 48.34 - (mAux *MinTmp - 40))
g. Auxiliary Input Temperature = (AuxiliaryInput -bAux)/mAux
See Table 14 for register numbers and variables.
Table 14. Temperature Data Registers.
7800 SERIES Sequence State Codes
Sequence state codes are provided by the Burner Control. Each
code is translated into two string codes for displaying an associated
message in two lines. Each code is also translated into burner
control state bits which may be used to generate and control system
diagrams on an operator interface.
The Sequence State Codes shown in Table 15 are valid only if the
Fault Code has a value of zero. If the Fault Code is non-zero, the
sequence state field contains the sequence state code when the
lockout occurred.
01B7-
01B8
40440-
40441
Unused U32
01B9 40442 Registers 40437-40440 are current U16 0-1
01BA 40443 Device Data Ready U16 Device data was properly received by S7810M.
Bit(s) Device
0 RM78XX
1 R7999
2 S7830 Expanded Annunciator
3 EC78XX
4-15 Unused
01BB 40444 S7810M Device Compatibility with
Current Software Revision
S7810M Software Revision
Compatibility with Legacy Software
Revisions.
U16 Device is compatible with the S7810M version
Bit Device
0 RM78XX
1 R7999
2 S7830 Expanded Annunciator
3 EC78XX
4-7 Unused
Used for indication of S7810M revision compatibility.
Bit(s) Compatible with:
8 Series 2
9-15 Future
Table 13. ModBus™ R7999 Register Assignments. (Continued)
Address
(hex)
Register
(dec) Parameter Name Format Notes
Register (Decimal) Variable
40142 AuxiliaryInput
40432 MinAuxTmp
40433 MaxAuxTmp
40334 ReleaseTemperatureCounts
40435 EnforceTemperatureCounts
Table 15. 7800 SERIES Sequence State Codes
and Associated register code values.
cb_sqst
Value
7800 SERIES
Sequence
State
String Code
Uses
mm:ss
Burner
Control
State BitsLine 1 Line 2
Fault
code not
zero
LOCKOUT 52 Table 17 8000h
0 UNUSED
HISTORY
0 0 0000h
1INITIATE 480 !0001h
2 INITIATE HOLD:
AC FREQUENCY/
NOISE
49 8 4001h
3 INITIATE HOLD:
AC LINE
DROPOUT
49 9 4001h
4 INITIATE HOLD:
AC FREQUENCY
49 7 4001h
5 INITIATE HOLD:
LOW LINE
VOLTAGE
49 60 4001h

S7810M MODBUS™ MODULE
11 65-0249—4
6 STANDBY 103 0 0002h
7 STANDBY HOLD:
REM
REMOTE
CONTROL
104 94 4002h
8 STANDBY HOLD:
START SWITCH
104 106 4002h
9 STANDBY HOLD:
F/G
FLAME
DETECTED
104 35 4002h
10 STANDBY HOLD:
T20
PREIGNITION
LOCK
104 86 4002h
11 STANDBY HOLD:
T7
RUNNING
INTERLOCK
104 101 4002h
12 STANDBY HOLD:
T7
LOCKOUT
INTERLOCK
104 55 4002h
13 STANDBY HOLD:
AIRFLOW
SWITCH
104 13 4002h
14 PURGE HOLD:
T19
HIGH FIRE
SWITCH
93 40 4004h
15 PURGE DELAY:
T19
HIGH FIRE
JUMPRD
89 39 4004h
16 PURGE HOLD:
TEST
RUN/TEST
SWITCH
93 98 4004h
17 PURGE DELAY:
T18
LOW FIRE
JUMPRD
89 56 4004h
18 PURGE HOLD: F/
G
FLAME
DETECTED
93 35 4004h
19 PURGE 87 0 !0004h
20 PURGE HOLD:
T18
LOW FIRE
SWITCH
93 58 4004h
21 PURGE HOLD: T7
RUNNING
INTERLOCK
93 101 4004h
22 PURGE HOLD:
LOCKOUT
INTERLOCK
93 54 4004h
23 PURGE HOLD:
AIRFLOW
SWITCH
93 13 4004h
24 PURGE HOLD:
START SWITCH
93 106 4004h
25 PILOT IGN 78 0 !0008h
Table 15. 7800 SERIES Sequence State Codes
and Associated register code values. (Continued)
cb_sqst
Value
7800 SERIES
Sequence
State
String Code
Uses
mm:ss
Burner
Control
State BitsLine 1 Line 2
26 PILOT HOLD:
TEST
RUN/TEST
SWITCH
77 98 4008h
27 PILOT HOLD:
START SWITCH
77 106 4008h
28 MAIN IGN 66 0 !0010h
29 MAIN IG HOLD:
MANUAL-OPEN
SWITCH
67 72 4010h
30 RUN 95 0 0020h
31 RUN PV HOLD:
LOW FIRE
SWITCH
96 58 4020h
32 PVHOLD IGN 96 66 !4020h
33 PV HOLD:
PV HOLD
SWITCH
96 45 4020h
34 RUN/LOWFIRE:
TEST
RUN/TEST
SWITCH
97 98 4020h
35 POSTPURGE 83 0 !0040h
36 STATE 36 31 0 A000h
37 RESET/ALARM
TEST
111 0 6000h
38 SAFE START
CHECK
102 105 4020h
39 SAFETY1-1 102 2 !4020h
40 SAFETY1-2 102 3 !4020h
41 SAFETY1-3 102 4 !4020h
42 SAFETY1-4 102 5 !4020h
43 SAFETY1-5 102 6 !4020h
44 Blank 0 0 2000h
45 PREIGNITION 84 0 !0080h
46 SAFETY 1 102 1 !4020h
47 PILOT STAB. 79 0 4080h
48 MAIN TRIAL 68 0 !4080h
49 MAIN TRIAL 68 0 4080h
50 STANDBY
HOLD:TEST
RUN/TEST
SWITCH
104 98 4002h
51 STATE 51 31 0 A000h
52 STATE 52 31 0 A000h
53 SAFETY 1: TEST
RUN/TEST
SWITCH
102 98 4020h
54 STATE 54 31 0 A000h
55 STANDBY HOLD:
PURGE FAN
SWITCH
104 92 4002h
56 STATE 56 31 0 A000h
57 PURGE HOLD:
PURGE FAN
SWITCH
93 92 4004h
58 STATE 58 31 0 A000h
Table 15. 7800 SERIES Sequence State Codes
and Associated register code values. (Continued)
cb_sqst
Value
7800 SERIES
Sequence
State
String Code
Uses
mm:ss
Burner
Control
State BitsLine 1 Line 2

S7810M MODBUS™ MODULE
65-0249—4 12
7800 SERIES String Codes
Table 16 contains a listing of all string codes provided by the S7810M.
The associated string is not implemented in the S7810M; it is a string
equivalent to that displayed on the S7800 Keyboard Display Module
or similar device.
59 STATE 59 31 0 A000h
60 STATE 60 31 0 A000h
61 STATE 61 31 0 A000h
62 STATE 62 31 0 A000h
63 STATE 63 31 0 A000h
64 STATE 64 31 0 A000h
65 STATE 65 31 0 A000h
66 STATE 66 31 0 A000h
67 INITIATE HOLD:
AC
AC PHASE
ERROR
49 10 4001h
68 STANDBY HOLD:
PREIGNITION
LOCK
104 86 4002h
69 STATE 69 31 0 A000h
70 STATE 70 31 0 A000h
71 BURNER OFF: T6
BURNER
SWITCH
22 23 4002h
72 STANDBY HOLD:
T6
EA HOLD MSG
104 30 4002h
73 STANDBY HOLD:
T6
CIRCUIT FAULT
104 25 4002h
74 STANDBY HOLD
(EA)
184 Table 19 4002h
75 PURGE HOLD
(EA)
185 Table 19 4004h
76 PILOT HOLD (EA) 186 Table 19 4008h
77 MAIN IG HOLD
(EA)
187 Table 19 4010h
78 RUN HOLD (EA) 188 Table 19 4020h
79 POSTPURGE
HOLD (EA)
189 Table 19 4040h
80 PREIGNITION
HOLD (EA)
190 Table 19 4080h
Table 15. 7800 SERIES Sequence State Codes
and Associated register code values. (Continued)
cb_sqst
Value
7800 SERIES
Sequence
State
String Code
Uses
mm:ss
Burner
Control
State BitsLine 1 Line 2
Table 16. 7800 SERIES String codes.
String Code String
0 (blank)
11
21-1
31-2
41-3
51-4
61-5
7 AC FREQUENCY
8 AC FREQUENCY/NOISE
9 AC LINE DROPOUT
10 AC PHASE
11 ACCESSORY FAULT
12 AIRFLOW SW. ON
13 AIRFLOW SWITCH
14 ATOMIZING SW
15 AUX INTERLOCK #4
16 AUX INTERLOCK #5
17 AUX LIMIT #1
18 AUX LIMIT #2
19 AUX LIMIT #3
20 BLOCK INTAKE
21 BOTH FUELS SELECT
22 BURNER OFF
23 BURNER SWITCH
24 CALL SERVICE
25 CIRCUIT FAULT
26 COMB. PRESSURE
27 CONTROL ON
28 DELAYED MV ON
29 DEVICE SPECIFIC
30 EA HOLD MESSAGE
31 ERROR STATE
32 FLAME AMP TYPE
33 FLAME AMP/SHUTR
34 FLAME AMPLIFIER
35 FLAME DETECTED
36 FLAME TOO STRONG
37 FLAME-OUT TIMER
38 FUEL SELECT OFF
39 HIGH FIRE JUMPERED
40 HIGH FIRE SWITCH
41 HIGH GAS PRESSURE
42 HIGH LIMIT
43 HIGH OIL PRESSURE
44 HIGH OIL TEMP
45 HOLD SWITCH

S7810M MODBUS™ MODULE
13 65-0249—4
46 IGNITION
47 IGNITION ON
48 INITIATE
49 INITIATE HOLD
50 JUMPERS CHANGED
51 JUMPERS WRONG
52 LOCKOUT
53 LOCKOUT ILK ON
54 LOCKOUT INTERLOCK
55 LOCKOUT SWITCH
56 LOW FIRE JUMPERED
57 LOW FIRE SW OFF
58 LOW FIRE SWITCH
59 LOW GAS PRESSURE
60 LOW LINE VOLTAGE
61 LOW OIL PRESSURE
62 LOW OIL TEMP
63 LWCO
64 MAIN FLAME FAIL
65 MAIN FLAME IGN.
66 MAIN IGN
67 MAIN IGN HOLD
68 MAIN TRIAL
69 MAIN VALVE ON
70 MAN-OPEN SW. OFF
71 MAN-OPEN SW. ON
72 OPERATING CONTROL
73 NO PURGE CARD
74 OTHER INTERLOCKS
75 OTHER PREIGN ILK
76 PILOT FLAME FAIL
77 PILOT HOLD
78 PILOT IGN
79 PILOT STABALIZE
80 PILOT VALVE 1 ON
81 PILOT VALVE 2 ON
82 POOR FLAME SENSOR
83 POSTPURGE
84 PREIGNITION
85 PREIGNITION ILK
86 PREIGNITION LOCK
87 PURGE
88 PURGE CARD ERROR
89 PURGE DELAY
90 PURGE FAN SW OFF
91 PURGE FAN SW ON
92 PURGE FAN SWITCH
93 PURGE HOLD
94 REMOTE CONTROL
Table 16. 7800 SERIES String codes. (Continued)
String Code String
95 RUN
96 RUN HOLD
97 RUN/LOWFIRE
98 RUN/TEST SWITCH
99 RUNNING ILK
100 RUNNING ILK ON
101 RUNNING INTERLOCK
102 SAFETY CHECK
103 STANDBY
104 STANDBY HOLD
105 START
106 START SWITCH
107 START SWITCH ON
108 TEST STATE
109 VALVE CLOSURE
110 ALL SWITCHES ON
111 RESET/ALARM TEST
112 Run/Test Switch RUN
113 Run/Test Switch TEST
114 Operator Control T6 = 0
115 Operator Control T6 = 1
116 Interlock T7 = 0
117 Interlock T7 = 1
118 Airflow Interlock T7 = 0
119 Airflow Interlock T7 = 1
120 Block Intake T7 = 0
121 Block Intake T7 = 1
122 Valve T8 = 0
123 Valve T8 = 1
124 Intrptd PV T8 = 0
125 Intrptd PV T8 = 1
126 Main Valve T9 = 0
127 Main Valve T9 = 1
128 Ignition T10 = 0
129 Ignition T10 = 1
130 PV Hold T16 = 0
131 PVHold T16 = 1
132 Input A T16 = 0
133 Input A T16 = 1
134 ManOpenSw T17 = 0
135 ManOpenSw T17 = 1
136 Input B T17 = 0
137 Input B T17 = 1
138 PreIgn ILK T17 = 0
139 PreIgn ILK T17 = 1
140 LowFire Sw T18 = 0
141 LowFire Sw T18 = 1
142 Purge Fan T18 = 0
143 Purge Fan T18 = 1
Table 16. 7800 SERIES String codes. (Continued)
String Code String

S7810M MODBUS™ MODULE
65-0249—4 14
7800 SERIES Fault Codes
Table 17 is a complete list of fault codes that may appear in the fault
code register. The Fault String Code register will contain the
corresponding String code identified in the table.
144 HighFire Sw T19 = 0
145 HighFire Sw T19 = 1
146 PreIgn ILK T20 = 0
147 PreIgn ILK T20 = 1
148 Lockout Inp T20 = 0
149 Lockout Inp T20 = 1
150 Comb Press T20 = 0
151 Comb Press T20 = 1
152 Valv/Start T21 = 0
153 Valv/Start T21 = 1
154 Intmitt PV T21 = 0
155 Intmitt PV T21 = 1
156 Terminal T6 = 0
157 Terminal T6 = 1
158 Terminal T7 = 0
159 Terminal T7 = 1
160 Terminal T8 = 0
161 Terminal T8 = 1
162 Terminal T9 = 0
163 Terminal T9 = 1
164 Terminal T10 = 0
165 Terminal T10 = 1
166 Terminal T16 = 0
167 Terminal T16 = 1
168 Terminal T17 = 0
169 Terminal T17 = 1
170 Terminal T18 = 0
171 Terminal T18 = 1
172 Terminal T19 = 0
173 Terminal T19 = 1
174 Terminal T20 = 0
175 Terminal T20 = 1
176 Terminal T21 = 0
177 Terminal T21 = 1
178 Jumper 1 Intact
179 Jumper 1 Clipped
180 Jumper 2 Intact
181 Jumper 2 Clipped
182 Jumper 3 Intact
183 Jumper 3 Clipped)
NOTE: The values that follow are generated when the fault code
is zero and the Expanded Annunciator code indicates that
one or more switches are open. The Line 2 string code will
indicate which switch is open.
184 STANDBY HOLD (EA)
185 PURGE HOLD (EA)
186 PILOT HOLD (EA)
187 MAIN IG HOLD (EA)
188 RUN HOLD (EA)
189 POSTPURGE HOLD (EA)
190 PREIGNITION HOLD (EA)
Table 16. 7800 SERIES String codes. (Continued)
String Code String
Table 17. 7800 SERIES Fault Codes.
Fault Code
(Reg 40001)
Fault Message
(NOTE: FAULT n: is not in
the Fault and Strings Code)
Fault String
Code
(Table 16)
0Blank (no fault) 0
1 FAULT 1: NO PURGE CARD 73
2 FAULT 2: AC FREQUENY/NOISE 8
3 FAULT 3: AC LINE DROPOUT 9
4 FAULT 4: AC FREQUENCY 7
5 FAULT 5: LOW LINE VOLTAGE 60
6 FAULT 6: PURGE CARD ERROR 88
7 FAULT 7: FLAME AMPLIFIER 34
8 FAULT 8: FLAME AMP/SHUTR 33
9 FAULT 9: FLAME DETECTED 35
10 FAULT 10: PREIGNITION ILK 85
11 FAULT 11: RUNNING ILK ON 100
12 FAULT 12: LOCKOUT ILK ON 53
13 FAULT 13: AIRFLOW SW. ON 12
14 FAULT 14: HIGH FIRE SWITCH 40
15 FAULT 15: FLAME DETECTED 35
16 FAULT 16: FLAME-OUT TIMER 37
17 FAULT 17: MAIN FLAME FAIL 64
18 FAULT 18: FLAME DETECTED 35
19 FAULT 19: MAIN FLAME IGN. 65
20 FAULT 20: LOW FIRE SW OFF 57
21 FAULT 21: RUNNING ILK 99
22 FAULT 22: LOCKOUT ILK 54
23 FAULT 23: AIRFLOW SWITCH 13
24 FAULT 24: CALL SERVICE 24
25 FAULT 25: CALL SERVICE 24
26 FAULT 26: MAN-OPEN SW. OFF 70
27 FAULT 27: START SWITCH ON 71
28 FAULT 28: PILOT FLAME FAIL 76
29 FAULT 29: LOCKOUT ILK 54
30 FAULT 30: RUNNING ILK 101
31 FAULT 31: LOW FIRE SW OFF 57
32 FAULT 32: AIRFLOW SWITCH 13
33 FAULT 33: PREIGNITION ILK 85
34 FAULT 34: CONTROL ON 27
35 FAULT 35: CALL SERVICE 24
36 FAULT 36: CALL SERVICE 24
37 FAULT 37: CALL SERVICE 24
38 FAULT 38: CALL SERVICE 24
39 FAULT 39: CALL SERVICE 24
40 FAULT 40: CALL SERVICE 24
41 FAULT 41: MAIN VALVE ON 69
42 FAULT 42: PILOT VALVE 1 ON 80
43 FAULT 43: IGNITION ON 47
44 FAULT 44: PILOT VALVE 2 ON 81

S7810M MODBUS™ MODULE
15 65-0249—4
45 FAULT 45: LOW FIRE SW OFF 57
46 FAULT 46: FLAME AMP TYPE 32
47 FAULT 47: JUMPERS CHANGED 50
48 FAULT 48: DELAYED MV ON 28
49 FAULT 49: MAN-OPEN SW. ON 71
50 FAULT 50: JUMPERS WRONG 51
51 FAULT 51: FLAME TOO STRONG 36
52 FAULT 52: CALL SERVICE 24
53 FAULT 53: LOCKOUT SWITCH 55
54 FAULT 54: COMB. PRESSURE 26
55 FAULT 55: PURGE FAN SW ON 91
56 FAULT 56: BLOCK INTAKE 20
57 FAULT 57: PURGE FAN SW OFF 90
58-66 FAULT 58-66: CALL SERVICE 24
67 FAULT 67: AC PHASE 10
68 FAULT 68: PREIGNITION ILK 85
69 FAULT 69: CALL SERVICE 24
70 FAULT 70: CALL SERVICE 24
71-75 FAULT 71-75: DEVICE SPECIFIC 29
76-93 FAULT 76-93: ACCESSORY FAULT 11
94-127 FAULT 94-127: CALL SERVICE 24
128 FAULT 128: POOR FLAME SENSOR 82
129–143 FAULT 129-143: CALL SERVICE 24
144 FAULT 33z: OTHER PREIGN ILKEA 75
145 FAULT 33y: VALVE CLOSUREEA 109
146 FAULT 32s: OTHER INTERLOCKSEA 74
147 FAULT 32r: AUX INTERLOCK #5EA 16
148 FAULT 32q: AUX INTERLOCK #4EA 15
149 FAULT 32p: AIRFLOW SWITCHEA 13
150 FAULT 32o: LOW GAS PRESSUREEA 59
151 FAULT 32n: HIGH GAS PRESSUREEA 41
152 FAULT 32m: ATOMIZING SWEA 14
153 FAULT 32k: LOW OIL TEMPEA 62
154 FAULT 32j: HIGH OIL TEMPEA 44
155 FAULT 32i: LOW OIL PRESSUREEA 61
156 FAULT 32h: HIGH OIL PRESSUREEA 43
157 FAULT 32g: BOTH FUELS SELECTEA 21
158 FAULT 32f: FUEL SELECT OFFEA 38
159 FAULT 32e: AUX LIMIT #3EA 19
160 FAULT 32d: HIGH LIMITEA 42
161 FAULT 32c: LWCOEA 63
162 FAULT 32b: AUX LIMIT #2EA 18
163 FAULT 32a: AUX LIMIT #1EA 17
164 FAULT 30s: OTHER INTERLOCKSEA 74
165 FAULT 30r: AUX INTERLOCK #5EA 16
Table 17. 7800 SERIES Fault Codes. (Continued)
Fault Code
(Reg 40001)
Fault Message
(NOTE: FAULT n: is not in
the Fault and Strings Code)
Fault String
Code
(Table 16)
166 FAULT 30q: AUX INTERLOCK #4EA 15
167 FAULT 30p: AIRFLOW SWITCHEA 13
168 FAULT 30o: LOW GAS PRESSUREEA 59
169 FAULT 30n: HIGH GAS PRESSUREEA 41
170 FAULT 30m: ATOMIZING SWEA 14
171 FAULT 30k: LOW OIL TEMPEA 62
172 FAULT 30j: HIGH OIL TEMPEA 44
173 FAULT 30i: LOW OIL PRESSUREEA 61
174 FAULT 30h: HIGH OIL PRESSUREEA 43
175 FAULT 30g: BOTH FUELS SELECTEA 21
176 FAULT 30f: FUEL SELECT OFFEA 38
177 FAULT 30e: AUX LIMIT #3EA 19
178 FAULT 30d: HIGH LIMITEA 42
179 FAULT 30c: LWCOEA 63
180 FAULT 30b: AUX LIMIT #2EA 18
181 FAULT 30a: AUX LIMIT #1EA 17
182 FAULT 29s: OTHER INTERLOCKSEA 74
183 FAULT 29r: AUX INTERLOCK #5EA 16
184 FAULT 29q: AUX INTERLOCK #4EA 15
185 FAULT 29p: AIRFLOW SWITCHEA 13
186 FAULT 29o: LOW GAS PRESSUREEA 59
187 FAULT 29n: HIGH GAS PRESSUREEA 41
188 FAULT 29m: ATOMIZING SWEA 14
189 FAULT 29k: LOW OIL TEMPEA 62
190 FAULT 29j: HIGH OIL TEMPEA 44
191 FAULT 29i LOW OIL PRESSUREEA 61
192 FAULT 29h: HIGH OIL PRESSUREEA 43
193 FAULT 29g: BOTH FUELS SELECTEA 21
194 FAULT 29f: FUEL SELECT OFFEA 38
195 FAULT 29e: AUX LIMIT #3EA 19
196 FAULT 29d: HIGH LIMITEA 42
197 FAULT 29c: LWCOEA 63
198 FAULT 29b: AUX LIMIT #2EA 18
199 FAULT 29a: AUX LIMIT #1EA 17
200 FAULT 23s: OTHER INTERLOCKSEA 74
201 FAULT 23r: AUX INTERLOCK #5EA 16
202 FAULT 23q: AUX INTERLOCK #4EA 15
203 FAULT 23p: AIRFLOW SWITCHEA 13
204 FAULT 23o: LOW GAS PRESSUREEA 59
205 FAULT 23n: HIGH GAS PRESSUREEA 41
206 FAULT 23m: ATOMIZING SWEA 14
Table 17. 7800 SERIES Fault Codes. (Continued)
Fault Code
(Reg 40001)
Fault Message
(NOTE: FAULT n: is not in
the Fault and Strings Code)
Fault String
Code
(Table 16)

S7810M MODBUS™ MODULE
65-0249—4 16
7800 SERIES Burner Control Fault History Records
Table 18 describes the registers that are part of a fault history record.
To determine the actual register address for a parameter within the
record, add the register offset to the start address of the record.
Expanded Annunciator
The codes shown in Table 19 are available in the Expanded
Annunciator First Out Code Register. These codes are normally
translated to the appropriate fault code by the Burner Control. The
fault code will then be translated to the appropriate first and second
line messages as shown in Table 17 for use by the UMC800 Operator
Interface.
207 FAULT 23k: LOW OIL TEMPEA 62
208 FAULT 23j: HIGH OIL TEMPEA 44
209 FAULT 23i LOW OIL PRESSUREEA 61
210 FAULT 23h: HIGH OIL PRESSUREEA 43
211 FAULT 23g: BOTH FUELS SELECTEA 21
212 FAULT 23f: FUEL SELECT OFFEA 38
213 FAULT 23e: AUX LIMIT #3EA 19
214 FAULT 23d: HIGH LIMITEA 42
215 FAULT 23c: LWCOEA 63
216 FAULT 23b: AUX LIMIT #2EA 18
217 FAULT 23a: AUX LIMIT #1EA 17
218 FAULT 22s: OTHER INTERLOCKSEA 74
219 FAULT 22r: AUX INTERLOCK #5EA 16
220 FAULT 22q: AUX INTERLOCK #4EA 15
221 FAULT 22p: AIRFLOW SWITCHEA 13
222 FAULT 22o: LOW GAS PRESSUREEA 59
223 FAULT 22n: HIGH GAS PRESSUREEA 41
224 FAULT 22m: ATOMIZING SWEA 14
225 FAULT 22k: LOW OIL TEMPEA 62
226 FAULT 22j: HIGH OIL TEMPEA 44
227 FAULT 22i: LOW OIL PRESSUREEA 61
228 FAULT 22h: HIGH OIL PRESSUREEA 43
229 FAULT 22g: BOTH FUELS SELECTEA 21
230 FAULT 22f: FUEL SELECT OFFEA 38
231 FAULT 22e: AUX LIMIT #3EA 19
232 FAULT 22d: HIGH LIMITEA 42
233 FAULT 22c: LWCOEA 63
234 FAULT 22b: AUX LIMIT #2EA 18
235 FAULT 22a: AUX LIMIT #1EA 17
236 FAULT 21s: OTHER INTERLOCKSEA 74
237 FAULT 21r: AUX INTERLOCK #5EA 16
238 FAULT 21q: AUX INTERLOCK #4EA 15
239 FAULT 21p: AIRFLOW SWITCHEA 13
240 FAULT 21o: LOW GAS PRESSUREEA 59
241 FAULT 21n: HIGH GAS PRESSUREEA 41
242 FAULT 21m: ATOMIZING SWEA 14
243 FAULT 21k: LOW OIL TEMPEA 62
244 FAULT 21j: HIGH OIL TEMPEA 44
245 FAULT 21i: LOW OIL PRESSUREEA 61
246 FAULT 21h: HIGH OIL PRESSUREEA 43
247 FAULT 21g: BOTH FUELS SELECTEA 21
Table 17. 7800 SERIES Fault Codes. (Continued)
Fault Code
(Reg 40001)
Fault Message
(NOTE: FAULT n: is not in
the Fault and Strings Code)
Fault String
Code
(Table 16)
248 FAULT 21f: FUEL SELECT OFFEA 38
249 FAULT 21e: AUX LIMIT #3EA 19
250 FAULT 21d: HIGH LIMITEA 42
251 FAULT 21c: LWCOEA 63
252 FAULT 21b: AUX LIMIT #2EA 18
253 FAULT 21a: AUX LIMIT #1EA 17
254 FAULT 10z: OTHER PREIGN ILKEA 75
255 FAULT 10y: VALVE CLOSUREEA 109
Table 18. Fault History Record Format.
Offset Parameter Name Access Format Notes
0 Fault code R U16 See Table 17.
1 Fault String R U16 See Table 16.
2 Sequence State R U16 See Table 15.
3 First line message R U16 See Table16.
4 Second line message R U16 See Table 16.
5 Sequence time R U16 Seconds.
6-7 Total cycles R U32
8-9 Total hours R U32
Table 19. Expanded Annunciator First Out Code.
EA Status Value
(binary) Status Message
Line 2 String Code
(Table 16)
0xx 00000 No Expanded Annunciator N/A
0xx 00001 Burner Sw. 23
0xx 00010 Operating Control 72
0xx 00011 Aux. Limit #1 17
0xx 00100 Aux. Limit #2 18
0xx 00101 LWCO 63
0xx 00110 High Limit 42
0xx 00111 Aux. Limit #3 19
0xx 01000 FuelSelect Off 38
0xx 01001 BothFuelSelect 21
0xx 01010 High Oil Pres. 43
0xx 01011 Low Oil Pres. 61
0xx 01100 High Oil Temp 44
0xx 01101 Low Oil Temp. 62
0xx 01110 Atomizing Sw. 14
Table 17. 7800 SERIES Fault Codes. (Continued)
Fault Code
(Reg 40001)
Fault Message
(NOTE: FAULT n: is not in
the Fault and Strings Code)
Fault String
Code
(Table 16)

S7810M MODBUS™ MODULE
17 65-0249—4
Response Message Format for Function Code 17.
This format is device specific and is only available for the 7800
SERIES burner control. See Table 20.
Table 20. Response Message Format for function code 17 (11h), (26 bytes).
aSlave ID: Always 0x78 when using RM78xx or EC78xx Relay Modules(1 byte) (byte 3).
bRun Indicator Status: Always FF=ON (one byte)(byte 4).
cDevice Description: 16 Character ASCII OS number for the Burner Control (11 bytes) (bytes 5-15).
Burner Control Type Codes
The burner control type code indicates the exact model number of the
burner control. See Table 21.
Table 21. Burner Control Type Codes.
7800 SERIES Burner Control State Bits
The burner control sequence state is translated into State Bit Register
as shown in Table 22.
R7999 Profile Data Structure
If an R7999 uses less than 24 indexes for its profile, then the unused
index data will be zero (refer to “Number of Profile Points” parameter
to get the actual number of profile points). Note that the profile
information will be zero for an unconfigured or disconnected R7999.
Up to 24 sets of data are used to build the profile. See Table 23.
0xx 01111 High Gas Pres. 41
0xx 10000 Low Gas Pres. 59
0xx 10001 Airflow Sw. 13
0xx 10010 Aux. ILK #4 15
0xx 10011 Aux. ILK #5 16
0xx 10100 All Switches On (or)
Other PII (if hold or lockout
condition exists)
110
75
0x1 XXXX Valve Closure 109
00XX XXXX Oil Select N/A
01XX XXXX Gas Select N/A
If the BC is in Standby and the 5LSB value is 1-16, then the cause of
the Standby Hold is the 5LSB value; otherwise the hold is “Circuit
Fault”.
Table 19. Expanded Annunciator First Out Code. (Continued)
EA Status Value
(binary) Status Message
Line 2 String Code
(Table 16)
Slave
Address
Function
Code Byte Count Slave IDa
Run Indicator
Statusb
Device
DescriptioncN/A CRC CRC
Byte 0 1 2 3 4 5-15 16-23 24 25
CODE DEVICE DESCRIPTION
0 (undefined)
100 RM7800E
101 RM7800G
102 RM7800L
103 RM7800M
104 RM7838A
105 RM7838B
106 RM7840E
107 RM7840G
108 RM7840L
109 RM7840M
110 RM7885A
111 RM7888A
112 RM7890A
113 RM7895A
114 RM7895B
199 RM78xx
200 EC7810A
201 EC7820A
202 EC7830A
203 EC7850A
204 EC7885A
205 EC7890A
206 EC7895A
207 EC7895C
299 EC78xx
Table 22. Burner Control State Bits.
BIT Description BC State Bits Register
0 Initiate 0000 0000 0000 0001
1 Standby 0000 0000 0000 0010
2 Purge 0000 0000 0000 0100
3 Pilot Ignition 0000 0000 0000 1000
4 Main Ignition 0000 0000 0001 0000
5 Run 0000 0000 0010 0000
6 Postpurge 0000 0000 0100 0000
7 Preignition 0000 0000 1000 0000
13 Alarm 1010 0000 xxxx xxxx
NOTE: Lockout bit is also set.
14 Hold 0100 0000 xxxx xxxx
One other bit may be on.
15 Lockout 1010 0000 0000 0000
NOTE: Alarm bit is also set.

S7810M MODBUS™ MODULE
65-0249—4 18
Table 23. R7999 Profile Data Structure.
R7999 Fault History Data Structure
This information is repeated 5 times for a total of 6 fault history
structures. See Table 24.
Table 24. R7999 Fault History Structure.
NOTE: The Next Fault Position points to the oldest fault. For exam-
ple: If the Next Fault Position is 4, then the order of faults
from the newest to the oldest is: 3, 2, 1, 0, 5, 4.
R7999 Status Message
The R7999 Status Message is added to an indexed circular buffer
once a second. An 8-second history of the data is available in
registers 40160-40208. Table 25 identifies the register data
structure which is the same for each buffer, 0-7. Register 40160, bits
0-2, points to the oldest buffer information, so if the Buffer Index is 3,
then buffer order from oldest to newest would be: 3, 4, 5, 6, 7, 0, 1, 2.
In a byte, bits are identified as bit 7 (MSBit) through bit 0 (LSBit).
In a word consisting of two bytes, all values are big-endian, that is,
bit 15 of the word is the MSBit of the first (lowest numbered) byte,
bit 8 is the LSBit of this byte, bit 7 is the MSBit of the next byte, and
bit 0 is the LSBit.
.
Offset Parameter Name Format Notes
0 Index U16H 0-23
Type U16L 0x00 = Unused
0x01 = Used
0x02 = Light Off
0x04 = Minimum
0x08 = Maximum
0x10 = Purge
0x20 = Stop
0x40 = Not Implemented
0x80 = Valid Segment
1 Firing Rate for the
current point.
U16 0-4095
2 Air actuator position for
the current point.
U16 0-4095
3 Fuel actuator position
for the current point.
U16 0-4095
4 FGR actuator position
for the current point.
U16 0-4095
5 Data in the previous 5
registers is current.
U16 0-1
Offset Parameter Name Format Notes
0 Fault Buffer Index U16H 0-5
Next Fault Index U16L Faults are stored in a circular
buffer. This register points to
the index of the next fault to
be logged. 0-5.
1 Cycle Count at the
time the alarm
occurred.
U32 0-1,000,000
3 Fault Code U16H See Table 26.
Operating State of
the device at the time
the alarm occurred.
U16L Same text enumeration as
“R7999 Status Message
0x0C” byte 5. Register 40132.
4 Not implemented U16H 1-6
Unused U16L 255
5 Data in the previous
5 registers is current.
U16 0-1
Table 25. R7999 Status Message.
Byte(s)
Description—R7999 circular buffer data
structure of registers 40161-40208. Some
of this data is interpreted by the S7810M
and is available in registers 40129-40144.
0Program Mode/Selected Fuel
Bits Description
7 Selected Fuel 0 = Fuel 1, 1 = Fuel 2
6 Fuel select input 2
5 Fuel select input 1
4 Active hold (4-20 mA Aux. Input is below its threshold
0-3 Program Mode—Enumerated
0 Initiate State
1 Normal Operation
2 Alarm Initiate State
3 Lockout
4 Not Configured
5 Factory Test
6 Low Voltage
7 Commissioning
8 Reset
1Current Fault—See Table 26.
2Current Operating Status—Enumerated:
0 Standby Hold
1 Standby Programmed Standby
2 Standby Main Valve
3 Standby Low Fire Main Valve
4 Standby Purge
5 Fault 1
6 Standby High Fire Main Valve
7 Fault 2
8 Processing Demand
9 Light Off
10 Modulate
11 Light Off Low Fire Main Valve
12 Purge
13 Fault 3
14 Purge Main Valve
15 Fault 4
16 Initialize
17 Post Purge
3-4 Air Actuator Position/Terminal States
Bits Description
15 LCO State
14 HFP State
13 LFP State
12 ALARM State
11-0 Current position of the Air Actuator (0-4095)
5-6 Active Fuel Actuator Position/Terminal States
Bits Description
15 LCI State
14 HF State
13 MV State
12 LF State
11-0 Current position of the active Fuel Actuator
(0-4095)
7-8 FGR Actuator Position/Terminal States
Bits Description
15 LCO Relay Drive 2 feedback
14 LCO Relay Drive 1 feedback
13 LCM State—the LCM state is the feedback
in between LCI and LCO
12 Auto/Manual select—Auto mode when it is 0
and Manual when it is 1
11-0 Current position of the FGR Actuator
(0-4095)
9Firing Rate Input—The current non-filtered analog-to-
digital reading of the CmA (SSLC) 4-20 mA firing rate
input. (0-255 = 0-21.1 mA).
10 Manual Pot Input—The current non-filtered analog-to-
digital reading of the Manual Potentiometer firing rate
input. (0-255 = 2.1-44.1 mA)
11 Auxiliary Input—The current non-filtered analog-to-digital
reading of the XmA (Auxiliary) 4-20 mA firing rate input.
(0-255 = 0-21.1 mA)

S7810M MODBUS™ MODULE
19 65-0249—4
R7999 Fault Text
The R7999 Fault Text is shown indexed by hexadecimal values.
Table 26. R7999 Fault Text.
Fault Code
(hexadecimal) Fault Text
0x13 MV On
0x14 HF and LF on
0x15 BC Transition
0x25 Move Limit Test
0x26 Target Move Test
0x36 Fuel Selection
0x37 HFP/LFP Output
0x41 Air Pot Feedback
0x42 F1 Pot Feedback
0x43 F2 Pot Feedback
0x44 FGR Pot Feedback
0x45 Air Wiper Resistance
0x46 F1 Wiper Resistance
0x47 F2 Wiper Resistance
0x48 FGR Wiper Resistance
0x49 Air Total Resistance
0x51 F1 Total Resistance
0x52 F2 Total Resistance
0x53 FGR Total Resistance
0x58 Stuck Reset
0x61 Initiate Timeout
0x67 Fuel Off Curve
0x68 FGR Off Curve
0x69 Air Off Curve
0x71 Air Offline
0x72 F1 Offline
0x73 F1 Offline
0x74 FGR Offline
0x82 Motor Speed
0x83 Air No Response
0x84 F1 No Response
0x85 F2 No Response
0x86 FGR No Response
0x91 CmA Out of Range
0x92 Manual Pot Range
0x93 XmA Out of Range
0x94 Demand Too Long

65-0249—4 G.R. Rev. 06-02 www.honeywell.com
Automation and Control Solutions
Honeywell Honeywell Limited-Honeywell Limitée
1985 Douglas Drive North 35 Dynamic Drive
Golden Valley, MN 55422 Scarborough, Ontario
M1V 4Z9
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™
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