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3.4. Modbus operation
3.4.1.
Functions supported
The following functions are supported by the Modbus
• 0x03:
• 0x06:
• 0x10:
3.4.2.
How Queries Work
The recommended interframe delay ≥ 500 ms. A lower value can cause
communication errors or inconsistent values.
3.4.3.
LEDs
The LEDs
9 and 10).
The LED
there is a Modbus communication.
The LED
the information circulates on the
boiler bus (this is not necessarily
the interface that communicates).
3.4.4.
Error codes
The following error codes may be sent by the interface:
Code
--
No response of the
NAVIPASS Modbus
01
Illegal function
02
Illegal data address
03
Illegal data value
06
Server device busy
15.12.2022
Simple / multiple reading
Simple writing
Multiple writing
CAUTION:
and
are a steady green when the interface is powered (terminals
flashes amber when
flashes amber when
Error
• wrong cable
• Time out of the PLC shorter than the that of the
NAVIPASS Modbus (see adjustment of the registry 9
paragraph 3.3)
• wrong address
• Incorrect configuration of the communication (see
adjustment of the register 8 paragraph 3.2)
• the function requested is not supported
• The Modbus address does not correspond to a
standard service
• The register number is different than expected
• the standard service is not implemented on the machine
• read requested with a standard write-only service
• write requested with a standard read-only service
• Reading a parameter with value --- on the screen
• the data are not correct
• The query is being dealt with, restart the query (see
paragraph 3.3)
A read or write request cannot have more than one
address at a time, except in the registers specified
in the "NB register" column.
Cause
NAVIPASS Modbus - Accessory
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