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101
Sending Commands from a PLC Section 7-2
Communications Port
Completion Codes The status of a SEND(090), RECV(098), and CMND(490) instruction after
execution is reflected as a communications port completion code, in one word
(two bytes) of data as shown in the following table. (The value is 0000 during
instruction execution.) The recorded status is saved until execution of the next
instruction.
The meanings of the communications port completion codes are the same as
those for FINS commands and responses (response codes). When
CMND(490) is used, however, even if a FINS command has an abnormal
completion, it will not be reflected in the communications port completion
code. For details, refer to
Communications Port Error Flag and Response
Codes CMND(490) on page 101.
Bits 08 to 15 in the communications port completion code correspond to the
first byte of the response code, and bits 00 to 07 correspond to the second
byte.
Communications Port Error Flag and Response Codes CMND(490)
Errors that occur when CMND(490) is used generate a Communications Port
Error Flag and are recorded in a communications port response code only in
the following cases:
• When a response timeout error has occurred.
• When the number of communications data bytes exceeds the maximum
value for the Unit (i.e., more than 1,014 bytes) after the FINS command
code for the FL-net Unit.
• When the actual number of response bytes is greater than the number of
reception bytes that has been set. (The response is not stored in this
case.)
Errors other than these are recorded in the response codes of the responses
stored from the beginning response storage word onwards. Be careful of
these, because there are no Communications Port Error Flags and they are
not recorded in a communications port response code.
Word Contents
A203 Communications Port 0 Completion Code
A204 Communications Port 1 Completion Code
A205 Communications Port 2 Completion Code
A206 Communications Port 3 Completion Code
A207 Communications Port 4 Completion Code
A208 Communications Port 5 Completion Code
A209 Communications Port 6 Completion Code
A210 Communications Port 7 Completion Code