AXL E ETH DIO16 M12 6M
8547_en_03 PHOENIX CONTACT 16
11.4 Acknowledge error message
To reset the error, it must be acknowledged.
The following options are available:
–Auto (default)
–Manual
This confirmation mode can be configured in the WBM only.
Auto (default)
The error is acknowledged “automatically” with the next
valid write access to the output process data.
(Net Fail in register 7996 is deleted and the NET LED
changes to green).
Manual
In “manual” mode the error must be acknowledged via reg-
ister 2006 or the web-based management.
12 Substitute value behavior
If Ethernet communication fails, all device outputs are set to
the previous parameterized substitute values.
Set the desired substitute value behavior
To set the desired substitute value behavior, the following
options are available:
– Web-based management
– Modbus register 2002
For further information, please refer to the “Fault response
mode” section.
13 Modbus protocols and registers
The device supports a Modbus/TCP server.
As such, the Modbus protocol can be used in a connection-
related (TCP) manner.
13.1 Modbus connections
The device supports up to eight Modbus/TCP connections
at the same time.
The connection can access different addresses simultane-
ously.
Since eight connections are supported, a connection can
quickly be restored. This means that the client can success-
fully restore an interrupted Modbus connection.
13.2 Modbus conformity classes
The device supports Modbus conformity classes
0 and 1 as well as parts of class 2.
13.3 Modbus function codes
The following function codes are supported:
Function
code
Function Description
FC1 Read coils Read output and input bits
FC2 Read input dis-
cretes
Read multiple input bits
FC3 Read holding
registers
Read words from outputs
and inputs
FC4 Read input reg-
isters
Read words from inputs
FC5 Write coil Write an output bit
FC6 Write single reg-
isters
Write word for output data
FC15 Write multiple
coils
Write multiple output bits
FC16 Write multiple
registers
Write several output words
FC23 Read/write mul-
tiple registers
Read and write several pro-
cess data for inputs and out-
puts
