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Mitsubishi Electric Melsec Q Series User Manual page 124

Profibus-dp master module
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4
FUNCTIONS
(2) Executing alarm acquisition
Remark
4
- 15
4.2 PROFIBUS-DPV1 Functions
4.2.2 Alarm acquisition
(b) Alarm read request (with ACK)
This request automatically sends ACK after reading an alarm.
ACK is returned in response to all read-out alarms.
Alarm generation
The alarm is read from the
DP-Slave.
ACK is returned to the alarm for
which processing is complete.
Take corrective actions for the
error that occurred on the
DP-Slave.
Completed
Figure 4.12 Procedure Using Alarm Read Request (with ACK)
Execute alarm acquisition by the following procedure:
(a) In the Slave status area (Alarm detection) (Un\G26416 to Un\G26424), identify
the DP-Slave where an alarm is occurring.
(b) Write the request data to the DP-Slave into the Alarm request area (Un\G26432 to
Un\G26434).
(c) Turn ON the Alarm read request signal (Y18).
(d) When alarm reading is completed, the read result is stored in the Alarm response
area (Un\G26446 to Un\G26768) and the Alarm read response signal (X18) turns
ON.
(e) Check the alarm stored in the Alarm response area (Un\G26446 to Un\G26768),
and turn OFF the Alarm read request signal (Y18).
POINT
In redundant systems, do not use the Alarm acquisition (
For program examples on the alarm acquisition, refer to the following:
• Single CPU system:
• Redundant system:
... Alarm read request (with ACK)
Section 7.5
Section 7.9.5
Section 7.9.5)

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