10 TROUBLESHOOTING

MELSEC-Q

10.3.15 Troubleshooting when data cannot be communicated with the ISDN sub-address

 

 

 

 

Non

Bidirection

Circumstance

Cause

Corrective action

MC

procedure

al protocol

 

 

 

 

protocol

 

 

• Sub-address is incorrect.

• Review the sub-address.

 

 

 

• Data cannot be

• Modem does not support ISDN sub-

• Use modem that supports ISDN sub-

 

 

 

communicated with ISDN

address.

address.

 

 

 

sub-address

• Sub-address is incorrectly partitioned.

• Review how to partition the sub-address

 

 

 

 

 

using the TA manual.

 

 

 

10.3.16 Troubleshooting when constant cycle transmission does not operate normally

 

 

 

 

 

 

 

 

 

 

 

Non

Bidirection

Circumstance

Cause

Corrective action

MC

procedure

al protocol

 

 

 

 

protocol

 

• Does not operate in the

• The setting value of the constant cycle

• Review the constant cycle transmission

 

 

 

cycle time designated in the

transmission is incorrect.

setting.

 

 

 

constant cycle transmission

• The cycle time is affected by some causes.

• Remove the causes or designate the cycle

 

 

 

setting

 

time anticipating the causes.

 

 

 

10.3.17 Troubleshooting when condition agreement transmission does not operate normally

 

 

 

 

 

Non

Bidirection

Circumstance

Cause

Corrective action

MC

 

procedure

 

al protocol

 

 

 

 

 

protocol

 

• Does not operate in the

• The setting value of the condition

• Review the condition agreement

 

 

 

 

cycle time designated in

agreement transmission is incorrect.

transmission setting.

 

 

 

 

condition agreement

• The cycle time is affected by some causes.

• Remove the causes or designate the cycle

 

 

 

 

transmission setting

 

time anticipating the causes.

 

 

 

 

10.3.18 Troubleshooting when data cannot be received by an interrupt program

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Non

Bidirection

Circumstance

Cause

Corrective action

MC

 

procedure

 

al protocol

 

 

 

 

 

protocol

 

 

• Interrupt issuance was not designated.

• Designate interrupt issuance.

 

 

 

 

 

• Receiving by instruction other than

• Use BUFRCVS instruction to receive

 

 

 

 

• Cannot receive data with

BUFRCVS.

interrupt data.

 

 

 

 

• "Parameter setting" - "PC system setting" -

• Review "Parameter setting" - "PS system

 

 

 

 

the interrupt program

 

 

 

 

or "Interrupt pointer setting" are not set on

setting" - "Interrupt pointer setting" on the

 

 

 

 

 

 

 

 

 

 

the PLC CPU side, or the settings are

PLC CPU side

 

 

 

 

 

incorrect.

 

 

 

 

 

10.3.19 Troubleshooting when data cannot be written to Flash ROM

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Non

Bidirection

Circumstance

Cause

Corrective action

MC

 

procedure

 

al protocol

 

 

 

 

 

protocol

 

 

• Flash ROM overwrite allow/prohibit was not

• Set Flash ROM overwrite allow/prohibit to

 

 

 

 

• Cannot write data to Flash

set to allow.

allow.

 

 

 

 

ROM

• Setting change was not set to allow in the

• Set setting change to allow in the switch

 

 

 

 

 

switch settings by GX Developer.

setting by GX Developer.

 

 

 

 

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10 - 42