1. Specifications
1-3
1.3 Support specifications for JEMA standard
Table 1-4 lists the communication services of the JEMA standard, and describes the J.NET module
communication commands and functions that support these services.
Table 1-4 JEMA standard services
JEMA standard
service name
J.NET module
command name
Function
Initialization
Issued automatically by
the system program
The J.NET module and stations exchange information when they start up.
When the J.NET module is reset or when the power switch of the power
supply module is turned on, the J.NET module exchanges information
automatically according to station information set by the user.
I/O
Issued automatically by
the system program
The J.NET module and stations exchange I/O data. Setting up an I/O area
of the J.NET module allows I/O communication to run automatically.
Data read
POLLING
command
The J.NET module inquires whether there is a request from a station. The
J.NET module automatically issues this command during idle times in
data communication that occur after exchanging initialization service
information with a station.
PUT
command
A station writes data to the J.NET module. After the station has
exchanged service information with the J.NET module, the data read
service PUT request causes the station to write data to the J.NET module.
GET
command
A station reads data from the J.NET module. After the J.NET module has
exchanged service information with a station, the data read service GET
request causes the station to read data from the J.NET module.
Data write
Not supported
The J.NET module reads data from and writes data to stations. The J.NET
module does not support this communication service.
Reset
Not supported
The J.NET module resets a station to the initial status. The J.NET module
does not support this communication service.
Broadcast
Not supported
The J.NET module sends data to all stations connected to the network.
The J.NET module does not support this communication service.
Message write
Not supported
The J.NET module writes messages to a station. The J.NET module does
not support this communication service.
Message read
Not supported
The J.NET module reads messages from a station. The J.NET module
does not support this communication service.
The initialization service, the I/O service, and the data read service automatically run between the J.NET module
and stations when the J.NET module is reset or powered on with station information loaded in its internal
parameter table.
Summary of Contents for 510VE
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