C - dh and dh+ command set, Dh and dh+ command set, Introduction – Rockwell Automation 1775-S5_SR5,D17756.5.5 User Manual PLC-3 FAMILY I/0 User Manual
Page 174

Appendix
C
C-1
DH and DH+ Command Set
Table C.A lists the DH and DH+ commands supported by the scanner. For
detailed information on using these commands, refer to the DH/DH+
Command Set User’s Manual (publication 1770-6.5.16).
The scanner can transmit 12 different commands on the link. The
addressing method determines which command is to be sent.
Table C.A
Basic Commands
Addressing Method
Command
CMD (Hex)
FNC (Hex)
PLCĆ2 logical data
Protected writeĆblock
00
N/A
Unprotected readĆblock
01
N/A
Protected writeĆbit
02
N/A
Unprotected writeĆbit
05
N/A
Unprotected writeĆblock
08
N/A
PLCĆ3 logical binary
or
Logical ASCII word range
Write block
0F
00
Read block
0F
01
Write bit
0F
02
Write file
0F
03
Read file
0F
04
Logical ASCII data type
Write block
0F
67
Read block
0F
68
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