Rockwell Automation 1395 ControlNet Communication Board - Manual (Page 39)

3–25 Configuration & PLC Interfacing
Publication 1395–5.37– March, 1999
Read System Clock This function reads the system time from the Drive.
PLC Block Transfer Instruction Data –
Write Read
Size In Elements: 4 11
Processor Type: PLC-5 PLC-5
Destination Address: N40:0-4 N40:0-10
Message Structure –
Message Header Information:
Word 1: 0
Word 2: 0
Function Code, Word 3: 1026
Write Message Length, Word 4: 8 bytes
0
PLC Message Write PLC Message Read
NOTE: Word 4 of the PLC Message Read instruction is broken down
into two bytes. The High byte contains the status bits
The Low byte contains the Drive message length in bytes.
Header
Word 1
0
Function Code
1026
Message Length
8 bytes
Header
Word 2
Header
Word 3
Header
Word 4
0
Header
Word 1
0
Function Code
1026
See Note
Header
Word 2
Header
Word 3
Header
Word 4
Month
(1–12)
Data
Word 5
Year
Data
Word 6
Day
(1–31) Data
Word 7
Data
Word 8
Data
Word 10
Data
Word 11
Hour
(0–24
Second
(0–59)
Data
Word 9 Minute
(0–59
10’s of msec
(0–100)
Message Operation – The READ SYSTEM CLOCK function
requests the Drive to provide its current time. The Drive stores time in
the 24 hour format. The values returned are integer type and may be
scaled by the PLC Controller prior to being used in the Program.