Mitsubishi Electric FX5-DP-M User Manual page 35

Execution of the alarm acquisition function
The procedure for execution the Alarm acquisition function (Alarm read request without ACK) and Alarm ACK request.
For a program example of the alarm acquisition function, refer to the following.
Page 111 Program Example of the Alarm Acquisition Function
1.
When an alarm occurs, the DIA LED turns on and bit corresponding to the DP-Slave where the alarm is occurring turns
on in 'Slave status area (Alarm detection)' (Un\G26416 to Un\G26420). ( Page 155 Slave status area (Alarm
detection))
2.
Write Alarm read request (without ACK) to 'Alarm request area' (Un\G26432 to Un\G26434).
( Page 156 Alarm request area)
3.
Turn on 'Alarm read request signal' (Un\G3.b8).
4.
Alarms are acquired and the results are stored in 'Alarm response area' (Un\G26446 to Un\G26768).
( Page 157 Normal response format when the alarm is read (without ACK))
5.
'Alarm read response signal' (Un\G1.b8) turns on. Check the alarm stored in 'Alarm response area' (Un\G26446 to
Un\G26768) and turn off 'Alarm read request signal' (Un\G3.b8).
6.
Write Alarm ACK request to 'Alarm request area' (Un\G26432 to Un\G26434).
7.
Turn on 'Alarm read request signal' (Un\G3.b8).
8.
ACK is returned and the results are stored in 'Alarm response area' (Un\G26446 to Un\G26768). ( Page 159 Normal
response format for alarm ACK)
9.
If ACK is returned for all alarms of the DP-Slave, the corresponding bit in 'Slave status area (Alarm detection)'
(Un\G26416 to Un\G26420) and the DIA LED turn off. If ACK is not returned for some alarms, the corresponding bit and
the DIA LED remain on.
10.
'Alarm read response signal' (Un\G1.b8) turns on. Check the alarm stored in 'Alarm response area' (Un\G26446 to
Un\G26768) and turn off 'Alarm read request signal' (Un\G3.b8).
DIA LED turns off when ACK is returned for all alarms if all of the following conditions are met.
• Bits of all DP-Slaves are off in 'Slave status area (Alarm detection)' (Un\G26416 to Un\G26420).
• Bit 11 is off for status 1 in 'Diagnostic information area' (Un\G23072 to Un\G23199).
BF LED turns off when ACK is returned for all alarms if all of the following conditions are met.
• Bits of all DP-Slaves are off in 'Slave status area (Alarm detection)' (Un\G26416 to Un\G26420).
• Bits of all DP-Slaves are off in 'Slave status area (Diagnostic information detection)' (Un\G23056 to
Un\G23060).
If ACK is not returned for all alarms, BF LED turns off when bits of all DP-Slaves are off in 'Slave status area
(Diagnostic information detection)' (Un\G23056 to Un\G23060), regardless of the alarm detection status.
4 FUNCTIONS
33
4.3 PROFIBUS-DPV1
4