Mitsubishi Electric FX5-DP-M, User Manual

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APPX
Appendix 3 Buffer Memory
133
A
■
Alarm read signals (Un\G3.b8) and (Un\G1.b8)
'Alarm read request signal' (Un\G3.b8) is turned on in accordance with each format settings of the 'Alarm request areas'
(Un\G26432 to Un\G26434) when an alarm is acquired in the specified DP-Slave.
Turning on 'Alarm read request signal' (Un\G3.b8) causes information in 'Alarm response area' (Un\G26446 to Un\G26768) to
be temporarily cleared, and acquired alarms are stored.
However, the following areas are not cleared when the alarm ACK request is issued.
When an alarm is acquired and ACK is returned to the appropriate DP-Slave, the DIA LED turns off when both 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).
When an alarm is acquired and ACK is returned to the appropriate DP-Slave, the BF LED turns off when both 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).
After an alarm is acquired and the result is stored in 'Alarm response area' (Un\G26446 to Un\G26768), 'Alarm read response
signal' (Un\G1.b8) turns on.
Turning off 'Alarm read request signal' (Un\G3.b8) causes 'Alarm read response signal' (Un\G1.b8) to turn off.
■ Communication READY signal (Un\G1.bB)
'Communication READY signal' (Un\G1.bB) turns on after 'Module READY signal' (Un\G1.bD) turns on and data exchange is
ready.
This signal turns off if an error that prevents data exchange occurs to the FX5-DP-M.
The signal is used as an interlock signal when 'Data exchange start request signal' (Un\G2.b0) is turned on.
■ Module ready signal (Un\G1.bD)
This signal turns on when the FX5-DP-M starts.
This signal turns off when the FX5-DP-M is not ready.
■
Watchdog timer error signal (Un\G1.bF)
This signal turns on when a watchdog timer error occurs to the FX5-DP-M.
'Watchdog timer error signal' (Un\G1.bF) does not turn off until the following operation is performed.
• Turning off and on the programmable controller
• Resetting the CPU module
Buffer memory address Description
Un\G26449 to Un\G26484 The area where alarm No.1 is stored.
Un\G26489 to Un\G26524 The area where alarm No.2 is stored.
Un\G26529 to Un\G26564 The area where alarm No.3 is stored.
Un\G26569 to Un\G26604 The area where alarm No.4 is stored.
Un\G26609 to Un\G26644 The area where alarm No.5 is stored.
Un\G26649 to Un\G26684 The area where alarm No.6 is stored.
Un\G26689 to Un\G26724 The area where alarm No.7 is stored.
Un\G26729 to Un\G26764 The area where alarm No.8 is stored.

Module starts

Communications are ready

When an error that prevents continuation occurs
OFF
OFF
OFF


OFF


OFF
OFF
'Module ready signal' (Un\G1.bD)
'Communication ready signal' (Un\G1.bB)