Product Overview

S7810M MODBUS™ MODULE
65-0249—07 22
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.
.
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.
0 Program 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
1 Current Fault—See Table 26.
2 Current 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)
9 Firing 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)
Table 25. R7999 Status Message. (Continued)
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.