Application of interfaces without data handling blocks Manual BG41/BG42/BG43
4-96 Rev. 99/49
4.2.5.5 Operating the clock
Command 4
With this command it is necessary to enter the channel number 0, as it applies for the entire building
block and is not assigned to any interface.
It is a command, which can contain 2 to 22 Bytes. The second byte further specifies the command 4
by means of the instructions 01 to 05.
Instruction 01: Read date and time in a packed
BCD format from PLC
(7 bytes, after 2 acknowledgement bytes)
Date and time are received through the data channel 0 in the following order:
- first acknowledgement byte
- second acknowledgement byte
- seconds
- minutes
- hours
-day
- month
- year
- weekday
Fig. 4-27: Operating the clock, command 4, instruction 01
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