5 WRITING DATA TO THE CPU MODULE
5.3 Precautions
123
5
• STMR instruction
If an STMR instruction exists within the range to be changed, the STMR instruction will be executed.
■Initializing the last execution if the ladder at the online change (ladder block) has an FB call
If a subroutine type FB is called within the changed ladder block, information of the last execution, such as the rising
instruction and the falling instruction within the FB definition of the called subroutine type FB, is not initialized.
■When the start-up of an interrupt program is delayed
When the online change (ladder block) is performed, the start-up of the interrupt program may be delayed. Therefore, when
the execution time is monitored for the interrupt program that uses the inter-module synchronous interrupt (I44) and multiple
CPU synchronous interrupt (I45), an error may be detected in the CPU module. ( Page 128 Error detection setting)
■Scan monitoring function during online changes
Some sections are not targeted for the scan monitoring while online changes are being performed, and therefore a WDT error
may not be detected if the scan time set in the scan time monitoring time (WDT) setting is exceeded.
■Increase in scan time of the online change (ladder block)
When a global label or a local label is added, or when there are many programs/FB files to be changed or many changes, the
scan time may be increased by several dozen milliseconds.
■Online change (ladder block) of when another function is performed
The online change (ladder block) cannot be performed during execution of the following functions. Check that the following
functions are not being executed and then perform the online change (ladder block).
• CPU module data backup/restoration function
• iQ Sensor Solution data backup/restoration function
(1) The STMR instruction functions because the STMR instruction is included in the ladder block where the online change has been executed.
(2) The STMR instruction does not function because the STMR instruction is not included in the ladder block where the online change is executed.
(3) The instruction functions even when M0 and M10 are off.
(4) The instruction does not function.
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
M0
M10
M20
1
1
2
2
END 0 END
M0
M20
M10
0 END 0
STMR T0 K10 M100
STMR T1 K10 M200
M0
M20
M10
STMR T0 K10 M100
STMR T1 K10 M200
1
2
M0
M20
STMR T0 K10 M100
STMR T1
K10
M200
(4)
(1)
(2)
(3)
STMR
instruction
STMR
instruction
Online change completion
1 scan
M10 is added at the online change.
To Next Page
Loading...
