Mitsubishi MELSEC Q series User Manual page 61

(1) Trigger condition
Specify a trigger condition by selecting appropriate items from the following.
Device change
specification
Condition
specification
Step No.
specification
When trigger instruction executed
When data logging trigger activated
*1 The following cases are not regarded as trigger conditions.
 When a trigger condition is met again after occurrence of the trigger
 When a trigger condition is met with no data sampling performed
*2 A trigger will also occur in a case other than program execution (such as link refresh, transient update, or a device test
conducted from a peripheral device).
(a) Condition specification
A trigger occurs when the state of the specified device or step meets the specified condition.
• Device change specification
A trigger occurs when the specified device condition is met. Select one from the following.
When the bit of the bit device rises
When the bit of the bit device falls
When the word device value meets the specified value
When data are written to a word device
The following devices can be specified as trigger conditions.
Type
X, Y, M, L, F, SM, V, B, SB, T (contact)
Bit device
Bit specification of word device: D, D (extended data register), SD, W, W (extended link register), SW, R, ZR, FD
T (current value), ST (current value), C (current value), D, D (extended data register), SD, W, W (extended link register),
Word device
SW, R, ZR, FD
*1 T (contact), ST (contact), and C (contact) are specified with TS, SS, and CS respectively.
For the above devices, index modification and indirect specification are not available.
Setting item
When the bit of the bit device
rises
When the bit of the bit device
falls
When the word device value
meets the specified value
When data are written to a
word device
Always
When execution condition is
ON
When execution condition is
OFF
When execution condition
rises
When execution condition
falls
Item
*1
, ST (contact)
CHAPTER 6 DATA LOGGING FUNCTION
*1
( Page 121, Section 8.4.8)
Description
A trigger occurs when the status of the specified device is changed
from off to on.
A trigger occurs when the status of the specified device is changed
from on to off.
A trigger occurs when the data that match the specified value are
*2
written , regardless of the current value status of the specified device
(match or not match with the specified value).
A trigger occurs when data are written
A trigger occurs any time regardless of the operation status of the
specified step.
A trigger occurs any time but only during operation execution of the
specified step.
A trigger occurs only not during operation execution of the specified
step.
A trigger occurs when the operation nonexecutable status of the
specified step is changed to the executable status.
A trigger occurs when the operation executable status of the specified
step is changed to the nonexecutable status.
A trigger occurs when the trigger logging set instruction (LOGTRG) is
executed.
A trigger occurs when the special relay (Data logging trigger) is turned
on.
Description
When the specified device is turned on
When the specified device is turned off
A trigger occurs when the data that match the specified value are
written, regardless of the current value status of the specified device
(match or not match with the specified value).
When data are written to the specified device
Description
*1 *1
, C (contact) , FX, FY
*2
to the specified device.
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