Yaskawa MP900 Series Ladder Programming Manual - Manual (Page 372)

7.4 Detailed Troubleshooting
7.4.2 I/O Errors
7-9
T
roubleshooting
7
7.4.2 I/O Errors
An I/O error can occur in the following cases.
• Option Module allocations or Module detail definitions were set in the Module Configuration.
• A cable was disconnected or a Module failed while the system was operating.
If an I/O error occurs, you can check the following system registers to check the I/O error.
You can also use the following system registers to find the address of the I/O register (IW††††/OW††††) for
which the I/O error occurred.
„ Example: When an I/O Error Was Detected for an I/O Device Assigned to IW1234
A value of 1234 hex will be stored in SW00202.
After you find the I/O register address, identify the slot of the Module and then find the I/O status from the following
system registers.
For details on I/O status, refer to 2.5.5 System I/O Error Status in the Machine Controller MP2000 Troubleshooting
Manual (Manual No.: SIJP C880700 40 (Japanese version)).
Name
Register
Address
Description
I/O Error Count SW00200 Number of I/O errors that have occurred (total of SW00201 and SW00203).
Input Error Count SW00201 Number of input errors that have occurred
Output Error Count SW00203 Number of output errors that have occurred
Name
Register
Address
Meaning
Input Error Address SW00202 The latest input error address (register address in IW††††)
Output Error Address SW00204 The latest output error address (register address in OW††††)
Name
Register
Address
Meaning
Input Error Address
SW00208 to
SW00215
CPU Function Module
SW00216 to
SW00223
Reserved for system.
SW00224 to
SW00231
Error status of Rack 1, Slot 1
SW00232 to
SW00239
Error status of Rack 1, Slot 2
SW00240 to
SW00247
Error status of Rack 1, Slot 3
SW00248 to
SW00255
Error status of Rack 1, Slot 4
... ...
SW00496 to
SW00503
Error status of Rack 4, Slot 9