Mitsubishi Electric Melsec Q Series User Manual page 172

6
PARAMETER SETTING
Item
Starting I/O number
Error action flag
Min. slave interval
Calculate time
Use 'Min. slave interval' for
'Target Token Rotation Time
(T_tr)'
Polling timeout
Slave watchdog
Calculate time
Estimated bus cycle time
Watchdog for time sync.
6
- 7 6.3 Master Parameters
Table6.3 Master Parameter Setting Items (Continued)
Set the start I/O number of the QJ71PB92V in three digits.
Setting range: 000 to FE0
H
Check this checkbox when sending a clear request to all DP-Slaves from the DP-Master.
When a communication error occurs even in one DP-Slave, the clear request is sent to all DP-Slaves
(Default: not selected).
Not checked: The clear request is not sent to all DP-Slaves.
Checked: The clear request is sent to all DP-Slaves.
Set the minimum required time from the slave polling cycle to the next one.
This set value is enabled on all connected DP-Slaves.
Set a value for the DP-Slave that needs the longest time.
Setting range: 1 to 65535 (Unit:
Select this checkbox to automatically set "Min. slave interval" based on the estimated value of the bus
cycle time.
Select this checkbox to automatically set the "Min. slave interval" value for "Target Rot. Time (T_tr)" of
the bus parameter.
Clear the checkbox when multiple DP-Masters are on a PROFIBUS-DP network.
The sum of "Min. slave interval" values of all DP-Masters is set to "T_tr".
Set the maximum time required for a requester to receive the response in communication between DP-
Masters.
Setting range: 1 to 65535 (Unit:
Select this checkbox to batch-set watchdog timer values for all DP-Slaves.
Setting range: 1 to 65025 (Unit:
Select this checkbox to set an optimum value for "Slave watchdog".
The value will be set to five times of the maximum estimated value of the bus cycle time and "Min. slave
interval".
Displays the estimated minimum interval of the bus cycle time.
When communications are performed with another DP-Master module or acyclic communications are
performed, the bus cycle time will be longer than the displayed value. (
When setting "Min. slave interval" and "Slave watchdog" using the displayed value, set sufficient time,
considering the time that will be taken for communications with another DP-Master module or acyclic
communications.
Set the time during which the transmission interval of the clock data sent from the time master is
monitored.
Setting range: 0 to 65535 (Unit:
* 1 The upper limit of the setting range varies depending on the QCPU mounted with the QJ71PB92V.
For details, refer to the manual for the QCPU used.
POINT
(1) When "Error action flag" is checked, outputs of all DP-Slaves are cleared
when a communication error occurs even in one DP-Slave.
To restart output, perform either of the following operations.
• Turn OFF the Data exchange start request signal (Y00) and then turn it
ON.
• Reset the QCPU.
(2) When using the PROFIBUS-DPV1 or PROFIBUS-DPV2 function, set a "Min.
slave interval" value greater than the bus cycle time calculated from Pt, Tsdi
and Lr. (
If the "Min. slave interval" is less than the value calculated from Pt, Tsdi and
Lr, the processing of the PROFIBUS-DPV1 or PROFIBUS-DPV2 function
may take time.
Description
*1
(Default: 000 )
H H
100 s, Default: 80
1 ms, Default: 50
10 ms, Default: 5
10 ms, Default: 0
Section 3.5.1)
100 s)
1 ms)
10 ms)
Section 3.5.1)
10 ms)