7.6 DATA and LINK LEDs
The CIM 500 Ethernet module has two connectivity LEDs related to
each RJ45 connector.
DATA1 and DATA2
These yellow LEDs indicate data traffic activity.
Status Description
Yellow off No data communication on the RJ45 connector.
Yellow flashing Data communication ongoing on the RJ45 connector.
Permanently yellow Heavy network traffic on the RJ45 connector.
LNK1 and LINK2
These green LEDs show whether the Ethernet cable is properly
connected.
Status Description
Green off No Ethernet link on the RJ45 connector.
Green on Ethernet link on the RJ45 connector is OK.
Related information
7.1 Connecting the Ethernet cable
8. Modbus function code overview
The supported function codes are shown in the table below:
Type
Code Hex Name
16-bit data
(registers)
03 0x03 Read holding registers
04 0x04 Read input registers
06 0x06 Write single register
16 0x10 Write multiple registers
Diagnostics 08 08 Diagnostics
Reading or writing coils are not supported.
The same data are available in both holding registers and input
registers, meaning that either function (0x03 or 0x04) can be used
for reading data.
Unless otherwise stated, the data type used for counters
and scaled values is always an unsigned integer.
Related information
13.6 Diagnostics, 0x08
15
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