CTH200 Series PLC User Manual
6.5.2 Data Log
MagicWorks PLC provides the Data Log Wizard to store process measurement data into
memory card. Moving process data to the memory card frees V memory addresses that would
otherwise be required to store this data
With this feature, you can permanently reserve the process data log, contains a time date stamp,
in program control. Up to 4 independent data log, whose format can be defined by new data
record wizard, can be configured.
All data logs are stored in the memory card, to use it, insert an optional 64K or 256K memory
card in your PLC. See Appendix O Battery Card and Memory Card for information about the
memory cards.
Use the S7-200 Explorer to upload the contents of your data logs to your computer. An example
of a Data Log application is shown as Figure 6-24.
For this cow:
H R ecord unique ID
H R ecord amount of
milk obtained
H R ecord cow
temperature
H R ecord milking time
Morning milking data buffer
in V memory
S7-200 Explorer
Data Log: ?Grain Bin Capaci ty?
Write Data Log Record
(with date and time stamp added)
Memory Cartridge
Cow #5 Milking Complete
Cow #5
Upload Data
Log Daily
03/22/2004 05:25:04 4 27.7 97.5 13.2
03/22/2004 05:21:04 7 30.8 97.3 12.7
03/22/2004 05:17:04 2 25.1 97.6 14.1
.
.
.
Data Log: ?Morning Milki ng?
5, 35.2, 98. 1, 14.5
CTH200 CPU
TP 10
Figure 6-24 Example of Data Log Application
Definition and Terminology of Data Log
The following definitions and terms explain you the Data Log Wizard:
1. A data log is a group of records usually ordered by date and time. Each record represents