Pepperl+Fuchs VBG-ENXK20-DMD-EV Manual page 82

AS-i 3.0 EtherNet/IP+Modbus TCP Gateway
Operation via Ethernet IP (Modbus/TCP)
03 46 60 00 01 ⇒ 128 02
List of exceptions:
• 01 ILLEGAL FUNCTlON
The function code received in the query is not an allowable action for the
slave. This may be because the function code is only applicable to newer
controllers, and was not implemented in the unit selected. It could also indi-
cate that the slave is in the wrong state to process a request of this type, for
example because it is unconfigured and is being asked to return register val-
ues.
• 02 ILLEGAL DATA ADDRESS
The data address received in the query is not an allowable address for the
slave. More specifically, the combination of reference number and transfer
length is invalid. For a controller with 100 registers, a request with offset 96
and length 4 would succeed, a request with offset 96 and length 5 will gener-
ate exception 02.
• 03 ILLEGAL DATA VALUE
A value contained in the query data field is not an allowable value for the
slave. This indicates a fault in the structure of the remainder of a complex
request, such as that the implied length is incorrect. It specifically does NOT
mean that a data item submitted for storage in a register has a value outside
the expectation of the application program, since the MODBUS protocol is
unaware of the significance of any particular value of any particular register.
• 04 ILLEGAL RESPONSE LENGTH
Indicates that the request as framed would generate a response whose size
exceeds the available MODBUS data size. Used only by functions generating
a multi-part response, such as functions 20 and 21.
• 05 ACKNOWLEDGE
Specialized use in conjunction with programming commands
• 06 SLAVE DEVlCE BUSY
Specialized use in conjunction with programming commands
• 07 NEGATlVE ACKNOWLEDGE
Specialized use in conjunction with programming commands
• 08 MEMORY PARlTY ERROR
Specialized use in conjunction with function codes 20 and 21, to indicate that
the extended file area failed to pass a consistency check.
• 0A GATEWAY PATH UNAVAILABLE
Specialized use in conjunction with Modbus Plus gateways, indicates that the
gateway was unable to allocate a Modbus Plus PATH to use to process the
request. Usually means that the gateway is misconfigured.
82
request: read 1 Register at index 4660
response: exception type 2 - „illegal data address"