S5-115F Manual STEP 5 Operations
3.2.9 "DO" Operation
Use the "DO" operation to process STEP 5 statements as indexed operations. This allows you to
change the parameter of an operand during control program processing (see Table 3-19).
Table 3-19. Overview of the “DO” Operation
Operation Meaning
Parameter
0 to 254
0 to 255
Operand
DO Processing a flag word or data word
ID
FW
DW
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"DO" Statements
"DO flag word or data word x" is a two-word statement that is unaffected by the RLO.
"DO" consists of the following two statements:
• The first statement contains the "DO" operation and a flag word or data word.
• The second statement defines the operation and the operand identifier you want the control
program to process. You must enter 0 or 0.0 as the parameter.
The control program works with the parameter that is stored in the flag word or data word. This
parameter is the one called up in the first statement. If you want to index binary operations,
inputs, outputs, or flags, you input the bit address in the high byte of this word. You input the
byte address in the low byte.
In any other instance, the high byte must be "0".
The following operations can be combined with the "DO" statement:
ExplanationsOperations
L FY, T FY, L FW, T FW, L IB, T IB, L QB, T QB, L IW,
T IW, L QW, T QW, L DL, T DL, L DR, T DR, L DW, T DW
CDB, JU OB, JU SB, JU FB, JU PB, JC OB, JC SB, JC FB,
JC PB
A F, = F, A T, AN T
S F, R F, R T
SS T, SE T
SLW, SRW
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Load and transfer operations
Block call operations (FBs must
have no formal parameters)
Boolean logic operations
Set/reset operations
Timer operations
Shift operations
!
Warning
Operations other than that listed in the above table are not permissible and will be
rejected by the operating system.
EWA 4NEB 811 6149-02
3-55
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