Alarm Acquisition - Mitsubishi Electric Melsec Q Series User Manual

4
FUNCTIONS

4.2.2 Alarm acquisition

This function enables acquisition of up to 8 alarms or status information data that have
been generated on any DP-Slave.
DP-Slave
(1) Requests available on the QJ71PB92V
There are the following two ways for acquiring alarms: using the Alarm read request
(without ACK) and Alarm ACK request, and using the Alarm read request (with ACK).
Whether the DP-Slave supports this function or not can be checked in the GSD file.
For details, refer to the manual for the DP-Slave.
(a) Alarm read request (without ACK), Alarm ACK request
DP-Master (Class 1)
Power
QJ71
QCPU
supply
PB92V
module
DP-Slave
Figure 4.10 Alarm Acquisition
Use these requests when a certain time may be required to return ACK after
reading an alarm from a DP-Slave (e.g. when taking corrective actions for the DP-
Slave error).
The Alarm ACK request enables ACK to be returned for each read-out alarm.
Alarm generation
The alarm is read from the
DP-Slave.
Take corrective actions for the
error that occurred on the DP-
Slave.
ACK is returned to the alarm for
which processing is complete.
Completed
Figure 4.11 Procedure Using Alarm Read Request (without ACK) and
Alarm ACK Request
4.2 PROFIBUS-DPV1 Functions
4.2.2 Alarm acquisition
Alarm
generation
DP-Slave
Alarm 1
Alarm 2
Alarm 8
... Alarm read request (without ACK)
... Alarm ACK request
1
2
3
4
5
6
7
8
4
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