Omron FQM1-MMA21, FQM1-CM001, FQM1-MMP21 operation manual Timer Area, I/O Memory, Appendix B

I/O Memory Appendix B

•Each TR bit can be used only once in one program section.

•The status of TR bits cannot be changed from the CX-Programmer. TB bits are used in the following cases.

•When there are two outputs with different LD instructions after the last branch point:

0000.00 TR0 0000.02 0002.03

0000.010000.04 0002.05

Instruction	Operand
LD	0000.00
OR	0000.01
OUT	TR 0
AND	0000.02
OUT	0002.03
LD	TR 0
AND	0000.04
OUT	0002.05

• When there is no LD instruction on the lower rung after a branch point:

0000.00 TR0 0000.01 0002.02

0002.03

Instruction	Operand
LD	0000.00

OUT	TR 0
AND	0000.01
OUT	0002.02
LD	TR 0
OUT	0002.03

Note In the following cases, there are either no LD instructions after the branch points, or any LD instructions are on the bottom rung. TR bits are not required in these types of branches.

0000.000002.01

0002.02

0000.000002.01

0000.02 0002.03

Instruction Operand

LD	0000.00
OUT	0002.01
OUT	0002.02
Instruction	Operand
LD	0000.00
OUT	0002.01
AND	0000.02
OUT	0002.03

Timer Area

The 256 timer numbers (T0000 to T0255) are shared by the TIM, TIMH(015), and TMHH(540) instructions. Timer Completion Flags and present values (PVs) for these instructions are accessed with the timer numbers.

When a timer number is used in an operand that requires bit data (e.g., in LD, AND, or OR instructions), the timer number accesses the Completion Flag of the timer. When a timer number is used in an operand that requires word data (e.g., in MOV(021) or CMP(020) instructions), the timer number accesses the PV of the timer. Timer Completion Flags can be used as often as necessary as normally open and normally closed con- ditions and the values of timer PVs can be read as normal word data.

Timer Completion Flags can be force-set and force-reset.

Timer PVs cannot be force-set or force-reset, although the PVs can be refreshed indirectly by force-setting/ resetting the Completion Flag.

There are no restrictions in the order of using timer numbers or in the number of NC or NO conditions that can be programmed. Timer PVs can be read as word data and used in programming.

Note It is not recommended to use the same timer number in two timer instructions because the timers will not operate correctly if they are timing simultaneously. (If two or more timer instructions use the same timer number, an error will be generated during the program check, but the timers will operate as long as the instructions are not executed in the same cycle.)

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