Rockwell-automation 1770, D17706.5.16 Ref Mnl DF1 Protocol Command Uživatelský manuál Strana 104

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7–17Communication Commands
Publication
17706.5.16 - 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
TNSDST SRC
Ele.
No.
File
Type
C
Byte
Size
File
No.
S/Ele.
No.
CMD
4F
STS
TNSSRC 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 0254 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.
8083 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 0254 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).
Subelement Number
Addresses subelements 0254 only. For higher addresses,
setting this byte to FF expands this field to three bytes. Use the
second and third bytes for the expanded subelement 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
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