
117
Specialized, use in conjunction with programming
commands.
The server (or slave) is engaged in processing a long–
duration program command. The client (or master)
should retransmit the message later when the server (or
slave) is free.
Specialized, use in conjunction with function codes 20
and 21 and reference type 6, to indicate that the
extended file area failed to pass a consistency check.
Specialized, use in conjunction with gateways. Indicates
that the gateway was unable to allocate an internal
communication path from the input port to the output
port for processing the request. Usually means that the
gateway is misconfigured or overloaded.
Gateway
Device Failed
to Respond
Specialized, use in conjunction with gateways. Indicates
that no response was obtained from the target device.
Usually means that the device is not present on the
network
Invalid
Response
from Slave
Command type or Slave address did not match request
(probably another unit)
Couldn’t connect to Modbus TCP server
Invalid Local
Memory
Address
Local address invalid in command - Memory location
does not exist or is not initialised.
No response to poll message
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