FUNCTION CODES
FUNCTION CODE 02 – READ INPUT STATUS
1TGC908004
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Function codes and their relevant address range are shown in the table below.
Function Codes
Address / Mapping Area
Starting Address used in Modbus
Frame
FC02
10001-19999
0-9999
FC04
30001-39999
0-9999
FC03, 06, 16
40001-49999
0-9999
Table 16 Address ranges of Function Codes
8.2.
Function Code 02 – Read Input Status
This function allows the control system to obtain the ON/OFF status of discrete inputs from
the Digital Gateway. With function code 2 following information can be requested.
•
Life Bits
•
Status Information
•
Control Access Information
•
Alarms
•
Trips
The valid address range: 10001-19999.
8.3.
Function Code 03 – Read Holding Registers
With function code 03, the control system can read the registers that can store the numerical
data, which can be driven to external devices as mentioned below.
•
Measuring Values
•
Status as Word-oriented bits
•
Alarm structure (Warnings/Trips)
The valid address range: 40001-49999
8.4.
Function Code 04 – Read Input Registers
Function code 04 obtains the contents of the input registers. These locations receive their
values from devices connected to the I/O structure of field units and can only be referenced,
not altered within the system or via MODBUS as mentioned below.
•
Status as Word-oriented bits
•
Alarm structure (Warnings/Trips)
The valid address range: 30001-39999
Summary of Contents for LVS Digital
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