11 TROUBLESHOOTING

MELSEC-Q

(9)A to Q/QnA conversion correspondences

Special relays SM1000 to SM1255 are the relays which correspond to ACPU special relays M9000 to M9255 after A to Q/QnA conversion.

All of these special relays are controlled by the system so that users cannot turn them ON/OFF in the program.

If users want to turn these relays ON/OFF, the program should be modified to use QCPU/QnACPU special relays.

For SM1084 and SM1200 through SM1255, however, if a user can turn ON/OFF some of special relays M9084 and M9200 through M9255 before conversion, the user can also turn ON/OFF the corresponding relays among SM1084 and SM1200 through SM1255 after the conversion.

For details on the ACPU special relays, see the user's manuals for the individual CPUs, and MELSECNET or MELSECNET/B Data Link System Reference Manuals.

POINT

The processing time may be longer when converted special relays are used with QCPU. Uncheck "A-series CPU compatibility setting" within the PC system setting in GX Developer PC parameters when converted special relays are not used.

REMARK

The following are additional explanations about the Special Relay for Modification column.

1When a special relay for modification is provided, the device number should be changed to the provided QCPU/QnACPU special relay.

2When is provided, the converted special relay can be used for the device number.

3When is provided, the device number does not work with QCPU/QnACPU.

Special Relay List

ACPU

Special

Special

 

 

 

 

Applicable

Special

Relay after

Relay for

Name

 

Meaning

Details

 

CPU

Relay

Conversion

Modification

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

• Turned on when there is one or more output units of

 

M9000

SM1000

 

 

 

 

OFF: Normal

which fuse has been blown.Remains on if normal status

 

 

 

 

Fuse blown

is restored.

 

 

 

 

ON

: Module with blown fuse

 

 

 

 

 

 

 

 

 

 

 

Output modules of remote I/O stations are also checked

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

fore fuse condition.

 

 

 

 

 

 

 

 

 

• Turned on if the status of I/O module is different form

 

 

 

 

 

 

 

 

 

entered status when power is turned on.

 

M9002

SM1002

 

 

 

I/O module

OFF: Normal

Remains on if normal status is restored.

 

 

 

 

I/O module verification is done also to remote I/O station

 

 

 

 

verification error

ON

: Error

 

 

 

 

 

 

 

 

 

 

modules.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(Reset is enabled only when special registers SD1116 to

 

 

 

 

 

 

 

 

 

SD1123 are reset.)

 

M9004

SM1004

 

 

 

 

OFF: Normal

• Turned on when the MINI(S3) link error is detected on

 

 

 

 

NIMI link error

even one of the MELSECNET/MINI master modules

QnA

 

 

 

ON

: Error

 

 

 

 

 

 

 

 

 

being loaded.Remains on if normal status is restored.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

• Comes ON it a momentary power interruption of less

 

 

 

 

 

 

 

 

 

than 20ms occurred during use of the AC power supply

 

 

 

 

 

 

 

 

 

module, and reset by turning power OFF, then ON.

 

M9005

SM1005

 

 

 

AC DOWN

OFF: AC DOWN not detected

• Comes ON if a momentary power interruption of less

 

 

 

 

than 10ms occurred during use of the DC power supply

 

 

 

 

detection

ON : AC DOWN detected

 

 

 

 

 

 

module, and reset by turning power OFF, then ON.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

• Comes ON if a momentary power interruption of less

 

 

 

 

 

 

 

 

 

than 1ms occurred during use of the DC power supply

 

 

 

 

 

 

 

 

 

module, and reset by turning power OFF, then ON.

 

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