Mitsubishi Electric Melsec Q Series User Manual page 121

4
FUNCTIONS
(a) Class1 services
(b) Class2 services
When executing a Class1 service, verify in advance that the bit corresponding to
the target DP-Slave is ON in the Slave status area (Normal communication
detection) (Un\G23040 to Un\G23047).
Table4.4 Available Services (Class1 services)
Service Name
READ(Class1_SERVICE)
WRITE(Class1_SERVICE)
* 1 The data that can be read or written by READ or WRITE services vary depending on the DP-Slave
to be used.
For details, refer to the manual for the DP-Slave.
Connect the line to the DP-Slave by the INITIATE service, and execute the READ
and/or WRITE services.
To end the acyclic communication, disconnect the line from the DP-Slave by the
ABORT service.
When executing a Class2 service to a DP-Slave that is exchanging I/O data, verify
in advance that the bit corresponding to the DP-Slave is ON in the Slave status
area (Normal communication detection) (Un\G23040 to Un\G23047).
When executing a Class2 service to a DP-Slave that is not exchanging I/O data,
verify in advance that the DP-Slave has been completely activated.
For details, refer to the manual for the DP-Slave.
Table4.5 Available Services (Class2 services)
Service Name
INITIATE(Class2_SERVICE)
ABORT(Class2_SERVICE)
READ(Class2_SERVICE)
WRITE(Class2_SERVICE)
* 2 The data that can be read or written by READ or WRITE services vary depending on the DP-Slave
to be used.
For details, refer to the manual for the DP-Slave.
4.2 PROFIBUS-DPV1 Functions
4.2.1 Acyclic communication with DP-Slaves
Description
Reads data from any specified DP-Slave. *
Writes data to any specified DP-Slave.*
Description
Establishes a line connection with any specified DP-Slave.
Disconnects a line connection from any specified DP-Slave.
Reads data from a DP-Slave connected to the line by the INITIATE
2
service. *
Writes data to a DP-Slave connected to the line by the INITIATE
2
service.*
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