Toshiba T2N - Manual (Page 172)

3.User Data
User's manual 159
Special Device Name Function
S0020 I/O bus error (Down) ON when I/O bus error
S0021 I/O mismatch error (Down)
ON when I/O mismatch error (allocation information and mounting state do not
agree)
S0022 I/O response error (Down) ON when no I/O response
S0023 I/O parity error (Down) ON when I/O data parity error occurs.
S0024 Reserved (for future use)
S0025 I/O interrupt error (Warning) ON when unused I/O interrupt occurs (operation continues)
S0026 Special module error (Warning) ON when fault occurs in special module (operation continues)
S0027
Reserved (for future use)
S0028
S0029
S002A
S002B
S002C
S002D
S002E
S002F
S0030 Program error ON when program fault occurs (OR condition of SW006-related flag)
S0031 Scan time error (Down) ON when scan cycle exceeds the limit value
S0032
Reserved (for future use)
S0033
S0034
S0035
S0036
S0037
S0038 EEPROM Initialization OFF:Normal ON:Initializing
S0039 EEPROM Error OFF:Normal ON:Error
S003A
Reserved (for future use)
S003B
S003C
S003D
S003E
S003F
*1) This area is for reference only (Do not write)
*2) The error flag becomes ON and is so maintained through the occurrence of a cause
(it is re-set when RUN starts-up)