Rockwell Automation 1770, D17706.5.16 Ref Mnl DF1 Protocol Command - Manual (Page 104)

7–17 Communication Commands
Publication 1770Ć6.5.16 - October 1996
protected typed logical read with three address fields
Reads data from a logical address in a SLC 500 module.
CMD
0F
STS
FNC
A2
TNS DST SRC
Ele.
No.
File
Type
C
Byte
Size
File
No.
S/Ele.
No.
CMD
4F STS
TNS SRC DST R DATA
EXT
STS
Field Description
Byte Size
The size of data to be read (in bytes), not including the address
fields or other overhead bytes.
File Number
Addresses files 0Ć254 only. For higher addresses, setting this
byte to FF expands this field to three bytes total. Use the
second and third bytes for the expanded file address (low
address byte first).
File Type
Use one of the these values for this field. Do not use any other
values; doing so may result in unpredictable results.
• 80Ć83 hex: reserved
• 84 hex: status
• 85 hex: bit
• 86 hex: timer
• 87 hex: counter
• 88 hex: control
• 89 hex: integer
• 8A hex: floating point
• 8B hex: output logical by slot
• 8C hex: input logical by slot
• 8D hex: string
• 8E hex: ASCII
• 8F hex: BCD
Element Number
Addresses elements 0Ć254 only. For higher addresses, setting
this byte to FF expands this field to three bytes. Use the second
and third bytes for the expanded element address (low address
byte first).
SubĆelement Number
Addresses subĆelements 0Ć254 only. For higher addresses,
setting this byte to FF expands this field to three bytes. Use the
second and third bytes for the expanded subĆelement address
(low address byte first).
DATA
• For SLC 5/01 or 5/02 = 82 bytes (41 words).
• For SLC 5/03 or 5/04
= 225 bytes with IP (does not apply to DF1 drivers)
= 236 bytes without IP (applies to DF1 drivers)
• SLC 500
• SLC 5/03
• SLC 5/04