Input Registers (Process Values)
The input registers provide the ability to read the scanner process values to a MODBUS
master. These values are read using MODBUS function code 4. MODBUS master cannot
write to these values. The process values use the following MODBUS registers, including
spare registers provided for future expansion.
These registers are 16-bits long. Since all the informations contained in this table is no
longer than 8 bits, information is packed into two values every 1 bits to make the data
transfer faster.
This information can be read by any MODBUS master conveniently configured.
Table 15.3: Process Value Registers (MODBUS)
Register Addresses
(decimal)
Scanner Process Values
5100 LoFlame status (0 = no flame and 1 = flame)
5100 HiFlame status for second sensor, if dual (0 = no flame and 1 = flame)
5101 LoFlame status for second flame relay, if single (0 = no flame and 1 = flame)
5101 HiSpare
5102 LoActive Function Set for Flame-relay
5102 HiActive Function Set for dual sensor of Safe-relay as second Flame-relay
5103 LoComposed scanner fault
5103 HiCombined scanner fault
5104 LoFault on sensor 1 (0 = no fault)
5104 HiFault on sensor 2 (0 = no fault)
5105 LoProgram change status (counter of the times configuration are changed, between
0 and 100, then rolls to zero)
5105 Hi
Spare
5106 LoIntensity for sensor 1
5106 HiFlicker-Frequency for sensor 1
5107 LoAC-Amplitude for sensor 1
5107 HiQuality for sensor 1
5108 LoCombustion index for sensor 1 (not supported)
5108 HiSpare
5109 LoIntensity for sensor 2
5109 HiFlicker-Frequency for sensor 2
5110 LoAC-Amplitude for sensor 2
5110 HiQuality for sensor 2
8VZZ005286 B 101
15 Serial Interfaces
15.2 MODBUS Protocol
To Next Page