Omron CJ1G-CPU series, Programming Manual

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59
Precautions Section 2-2
As an example, consider the results of executing a block transfer with
XFER(070) if 20 words are specified for transfer beginning with W500. Here,
the Work Area, which ends at W511, will be exceeded, but the instruction will
be executed without turning ON the Error Flag. In the PLC memory
addresses, the present values for timers are held in memory after the Work
Area, and thus for the following instruction, W500 to W511 will be transferred
to D00000 to D00011 and the present values for T0000 to T0007 will be trans-
ferred to D00012 to D00019.
Note Refer to Appendix D Memory Map of PLC Memory Addresses for specific
PLC memory addresses.
2-2-2 Special Program Sections
CS/CJ-series programs have special program sections that will control
instruction conditions. The following special program sections are available.
Instruction Combinations
The following table shows which of the special instructions can be used inside
other program sections.
T0000
Number of words
First source word
First destination word
Trans-
ferred.
to
to
to
to
to
to
to
to
W500
W511
&10
Program section Instructions Instruction condition Status
Subroutine SBS, SBN and RET instruc-
tions Subroutine program is exe-
cuted. The subroutine program sec-
tion between SBN and RET
instructions is executed.
IL - ILC section IL and ILC instructions Section is interlocked The output bits are turned
OFF and timers are reset.
Other instructions will not be
executed and previous status
will be maintained.
Step Ladder section STEP S instructions and
STEP instructions
FOR-NEXT loop FOR instructions and NEXT
instructions Break in progress. Looping
JMP0 - JME0 section JMP0 instructions and JME0
instructions Jump
Block program section BPRG instructions and
BEND instructions Block program is executing. The block program listed in
mnemonics between the
BPRG and BEND instruc-
tions is executed.
Subroutine IL - ILC
section
Step ladder
section
FOR - NEXT
loop
JMP0 - JME0
section
Block program
section
Subroutine Not possible. Not possible. Not possible. Not possible. Not possible. Not possible.
IL - ILC OK Not possible. Not possible. OK OK Not possible.
Step ladder
section Not possible. OK Not possible. Not possible. OK Not possible.
FOR - NEXT
loop OK OK Not possible. OK OK Not possible.
JMP0 - JME0 OK OK Not possible. Not possible. Not possible. Not possible.
Block pro-
gram section OK OK OK Not possible. OK Not possible.