User`s manual

CHAPTER 2: PROGRAMMING
19
SOI Configuration Data Menu
This section describes the PLC-specific requirements that the SOI-SPS
programming software supports. The programming information may
be found at the SOI Configuration Data Menu in the SOI-SPS soft-
ware.
Note: Refer to the SOI-SPS programming software manual for complete
details on programming and additional information regarding the SOI
configuration Data Menu. In addition, refer to the Siemens PLC
operations manual for details on the specific PLC you are working with.
Time Synchronization
The Real Time Clock of the SOI-260 may either be written to the PLC
or synchronized with the PLC by utilizing the Write Time or Read
Time selections, respectively. These selections are located after selecting
the Time Synchronization selection from the SOI Configuration Data
menu.
The Real Time Clock data will be written to the PLC in a batch of eight
byte registers. A base register is defined as the first of eight bytes to hold
the clock data. These eight byte registers contain data as follows:
Base Unused
Base +1 Day of Week, 1-7 (Sunday=1)
Base +2 Day of Month, 1-31
Base +3 Month, 1-12
Base +4 Year, tens and units (e.g., 1995=95)
Base +5 Hour, 0-23
Base +6 Minutes, 0-59
Base +7 Seconds, 0-59
The clock data will be synchronized on a 60-69 second interval. These
eight locations should not be the actual clock location of the PLC as the
SOI is not setting the PLC clock itself but simply providing a clock
source to the PLC at a certain location.