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9. Exclusive Commands
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9.5 External Search
9.5.1 Function
When PLC specifies the program number, sequence number, and block number of a work program
for the controller, the external search function searches memory or tape for the program number,
sequence number, and block number.
9.5.2 Interface
PLC sets data except the status.
Two bytes
command
Status
Program No.
Sequence No.
Block No.
System designation
Rn+0
1
2
3
4
5
6
7
8
(Note 1) File register (Rn) that can be used by the user
is used for the control data buffer.
Data register (Dn) cannot be used.
(Note 2) System designation is not used.
Two bytes
Four bytes
Four bytes
Four bytes
Two bytes
(1) Command
Sub command
Main command
F8710
1: search
2: PLC axis control
Search mode
0: Memory search
1: Tape search
PLC axis control
Set all to 0.
Specify "1"
(Note)
Unassigned bits will be used for later function
extension. Use only bits shown here.