Profibus-Dpv1 Functions; Acyclic Communication With Dp-Slaves - Mitsubishi Electric Melsec Q Series User Manual

4
FUNCTIONS

4.2 PROFIBUS-DPV1 Functions

4.2.1 Acyclic communication with DP-Slaves

This function allows data reading/writing to DP-Slaves at any specific timing independently
of I/O data exchange.
Up to eight requests are executable.
(1) Services available on the QJ71PB92V
4
- 11 4.2 PROFIBUS-DPV1 Functions
4.2.1 Acyclic communication with DP-Slaves
POINT
(1) To utilize PROFIBUS-DPV1 functions, use a DP-Slave that supports the
PROFIBUS-DPV1.
For details, refer to the manual for the DP-Slave.
(2) When using the PROFIBUS DPV1 function, set a "Min. slave interval" value
greater than the bus cycle time calculated from Pt, Tsdi and Lr. (
3.5.1)
If the "Min. slave interval" is less than the value calculated from Pt, Tsdi and
Lr, the processing of the PROFIBUS-DPV1 function may take time.
Power
supply
module
Writing data to
any DP-Slave
DP-Slave
Figure 4.9 Acyclic Communication
In acyclic communications, there are two types of services: Class1 and Class2
services.
The services available on the QJ71PB92V differ depending on whether or not the
target DP-Slave is performing I/O data exchange.
Target DP-Slave
DP-Slave performing I/O data exchange
DP-Slave not performing I/O data exchange
Whether the DP-Slave supports each service or not can be checked in the GSD file.
For details, refer to the manual for the DP-Slave.
DP-Master (Class 1)
QJ71
QCPU
PB92V
I/O data exchange
DP-Slave DP-Slave
Table4.3 Available Services
Reading data from
any DP-Slave
Available Service
Class1 service Class2 service
: Available,
Section
: Not available