Omron SYSMAC CV Series User Manual (English)

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569

Appendix B

Error and Arithmetic Flag Operation

The following table shows the instructions that affect the ER, CY, GR, LE, EQ, OF, UF, and N flags. In general,

ER indicates that operand data is not within requirements. CY indicates arithmetic or data shift results. GR

indicates that a compared value is larger than some standard, LE that it is smaller, EQ that it is the same. EQ

also indicates a result of zero for arithmetic operations. N generally indicates that bit 15 of the result word is

ON. OF indicates that the results was greater than could be stored in memory; UF indicates that the results

was less than could be stored in memory. Refer to subsections of

Section 5 Instruction Set

for details.

A set value (SV) BCD check is carried out at the time of resetting (TIM, CNT, TIMH(015), TIML(121),

TCNT(123), TIMW<013>, CNTW<014>, and TMHW<015>), or counting (CNTR(012), TTIM(120), and

MTIM(122)).

When CCL(172) is executed, the status of these flags will return to the status when CCS(173) was last

executed. CCL(172), STC(078), and CLC(079) are the only instructions that can directly change the status of

the arithmetic flags.

“ON/OFF” in the table indicate the flags that are turned ON and OFF according to the result of the instruction.

Although ladder diagram instructions, TIM, CNT, TIMH(015), CNTR(012), TIML(121), TIMW<013>,

CNTW<014>, and TMHW <015> are executed when ER is ON, other instructions with “ON/OFF” under the

Error Flag (A50003) column are not executed if ER is ON. All of the other flags in the following table will also

not operate when ER is ON.

Instructions not shown do not affect any of the flags in the table. Although only the non-differentiated form of

each instruction is shown, all variations of an instructions affect flags in exactly the same way.

Instructions marked with an asterisk (*) are supported by version-2 CVM1 CPUs only.

The status of the ER, CY, GT, LT and EQ Flags is affected by instruction execution and will change each time an

instruction that affects them is executed. Differentiated instructions are executed only once when their execution

condition changes (ON to OFF or OFF to ON) and are not executed again until the next specified change in their

execution condition. The status of the ER, CY, GT, LT and EQ Flags is thus affected by a differentiated instruction

only when the execution condition changes and is not affected during scans when the instruction is not executed,

i.e., when the specified change does not occur in the execution condition. When a differentiated instruction is not

executed, the status of the ER, CY, GT, LT and EQ Flags will not change and will maintain the status produced by

the last instruction that was executed.

Instructions A50003

(ER)

A50004

(CY)

A50005

(GR)

A50006

(EQ)

A50007

(LE)

A50008

(N)

A50009

(OF)

A50010

(UF)

TIM

ON/OFF

CNT

JMP(004)

ON/OFF

FAL(006)

FALS(007)

CNTR(012)

TIMH(015)

CMP(020)

ON/OFF ON/OFF ON/OFF ON/OFF

CMPL(021)

BCMP(022)

ON/OFF ON/OFF

TCMP(023)

MCMP(024)

EQU(025) ON/OFF

CPS(026)*

ON/OFF ON/OFF ON/OFF ON/OFF

CPSL(027)*

CMP(028)*

CMPL(029)*

Note “ON/OFF” means that the flag is affected by the result of instruction execution.

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Omron SYSMAC CV Series Specifications

General

Series	SYSMAC CV Series
Type	PLC
Input Voltage	100 to 240 VAC, 24 VDC
Number of Inputs	Varies by model
Number of Outputs	Varies by model
I/O Capacity	Up to 2048 points
I/O Points	Varies by model
Communication Ports	RS-232C, RS-422/485
Programming Language	Ladder Logic
Power Supply	100-240V AC or 24V DC
Mounting	DIN rail mounting
Operating Temperature	0°C to 55°C