266
20 DATA LOGGING FUNCTION
20.5 Logging Type
Trigger Condition
The following table lists the conditions to be used as a trigger.
The AND condition using a combination of "Device change specification" and "Step No. specification" results
in the collection of data at the time when both conditions are established.
■Device change specification
A trigger occurs when the monitored data meets the specified condition.
• Specifying the monitored data
For the device change specification, monitored data can be configured to be collected from the devices listed in the following
table.*
The data types that can be selected include bit/word (unsigned), word (signed), double word (unsigned), and double word
(signed). If double word (unsigned) or double word (signed) is specified, a trigger occurs only when as much data as one
double word is written. No trigger occurs when only the upper or lower word of a double word is written.
*1 An index modified device and indirectly specified device cannot be specified.
*2 For bit devices, digit specification is not supported.
*3 For word devices, bit specification is allowed.
*4 To specify these devices with CPU Module Logging Configuration Tool, use T (contact): TS, ST (contact): STS, C (contact): CS, LT
(contact): LTS, LST (contact): LSTS, and LC (contact): LCS.
Trigger condition Description
Condition specification Device change specification A trigger occurs when the monitored data meets the specified condition.
Step No. specification A trigger occurs when the specified condition is met immediately before the execution of the
specified step.
When trigger instruction executed A trigger occurs when the LOGTRG instruction is executed.
Conditional formula Description
When the specified data turns on
When the specified data turns off
= When the monitored data is equal to the comparison value, regardless of whether or not its current value is equal.
When the monitored data is not equal to the comparison value, regardless of whether or not its current value is equal.
When the monitored data is greater than or equal to the comparison value, regardless of whether or not its current
value is equal.
> When the monitored data is greater than the comparison value, regardless of whether or not its current value is equal.
When the monitored data is less than or equal to the comparison value, regardless of whether or not its current value is
equal.
< When the monitored data is less than the comparison value, regardless of whether or not its current value is equal.
At change When the current value of the specified data changes
Type Device
*1
Device Bit device
*2
X, Y, M, L, F, SM, V, B, SB, T (contact)
*4
, ST (contact)
*4
, C (contact)
*4
, LT (contact)
*4
, LST (contact)
*4
, LC
(contact)
*4
, FX, FY
Word device
*3
T (current value), ST (current value), C (current value), D, SD, W, SW, RD, R, ZR, Z, FD
Double-word device LT (current value), LST (current value), LC (current value)
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