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6 Message Communications
6-2
CJ-series PROFINET IO Controller Unit Operation Manual for NJ-series CPU Unit (W511)
6-1
Overview
Message communications enable messages to be sent between nodes on a PROFINET network when
required by system conditions. The messages can be issued from a CPU Unit to a PROFINET IO Con-
troller Unit and/or an IO Device. You can use them to read alarm codes and read/clear the error log as
well as other functions.
The CJ1W-PNT21 PROFINET IO Controller Units support two types of message communications:
•
Message commands targeted at the Unit itself with the purpose of sending or retrieving data or invok-
ing control actions (0101, 2102, 2103).
•
Explicit messages targeted at IO Devices such as the GRT1-PNT Unit (2801)
The figure below depicts the message command structure for the CJ1W-PNT21 PROFINET IO Control-
ler units.
CPU Unit
PROFINET I/O
Controller Unit
PROFINET network
SendCMd
Instruction
Other Message
Other
message
function
(0101 Hex)
(2102 Hex)
(2103 Hex)
Explicit Message
Explicit
message
function
SendCMd
Instruction
(2801 Hex)
Explicit message
Содержание CJ1W-PNT21
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