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APPX
Appendix 4 Buffer Memory
Link scan information (group number 2)
■Link scan information (group number 2) (Un\G4121 to Un\G4123)
Link scan information of group number 2 is stored.
Diagnostic request information
■Diagnostic request information (Un\G4127)
Specify a slave station number whose diagnostic information (Un\G4129 to Un\G4159) is to be displayed.
• 0: Not Set
• 1 to 32: Displays the diagnostic information for the specified station No.
Diagnostic information status flag
■Diagnostic information status flag (Un\G4128)
After the END instruction of the scan where the bit 0 of 'Diagnostic information display request' (Un\G4162) is turned off and
on is executed, the status (valid or invalid) of diagnostic information (Diagnostic information 1, Diagnostic information 2) of the
slave station specified in 'Diagnostic request information' (Un\G4127) is stored.
The valid/invalid conditions are given below.
• If the station number of the slave station that is specified in 'Diagnostic request information' (Un\G4127) is the start station
number of the occupied stations and the cyclic transmission is performed for the slave station, 1 is stored in b0 to b7 and b8
to b15. (If the specified slave station is a reserved station, 0 is stored in b8 to b15.)
• If the station number of the slave station that is specified in 'Diagnostic request information' (Un\G4127) is other than the
start station number of the occupied stations or the cyclic transmission is not performed for the slave station, 0 is stored in
b0 to b7 and b8 to b15.
• When b0 to b7 are valid, the number of occupied stations, group number, IP address, the accumulated number of timeouts,
and the accumulated number of disconnection detection are stored in 'Diagnostic information 1' (Un\G4129 to Un\G4143).
When invalid, 0 is stored in 'Diagnostic information 1' (Un\G4129 to Un\G4143).
• When b8 to b15 are valid, the Manufacturer code, model code, device version, module information, error code, and detailed
module information are stored in 'Diagnostic information 2' (Un\G4130 to Un\G4159). When invalid, 0 is stored in
'Diagnostic information 2' (Un\G4130 to Un\G4159).
Diagnostic information 1
■Diagnostic information 1 (Un\G4129 to Un\G4143)
When 1 (valid) is stored in b0 to b7 of 'Diagnostic information status flag' (Un\G4128), the number of occupied stations, group
number, IP address, the accumulated number of timeouts, and the accumulated number of disconnection detection are
stored.
When 0 (invalid) is stored in b0 to b7 of 'Diagnostic information status flag' (Un\G4128), 0 is stored.
Address Name Description
Un\G4121 Maximum link scan time (Unit: ms) The maximum link scan time value during cyclic transmission is stored. (Unit: ms)
Un\G4122 Minimum link scan time (Unit: ms) The minimum link scan time value during cyclic transmission is stored. (Unit: ms)
Un\G4123 Current link scan time (Unit: ms) The current link scan time value during cyclic transmission is stored. (Unit: ms)
Address bit Name Description
Un\G4128 b0 to b7 Diagnostic information 1 • On: Valid
• Off: Invalid
b8 to b15 Diagnostic information 2
Address Name Description
Un\G4129 Number of occupied stations Number of occupied stations in a slave station specified is stored.
Un\G4130 Group number
*1
Group number in a slave station specified is stored.
Un\G4131 IP address
*1
IP address (3rd octet, 4th octet) in a slave station specified is stored.
*2
Un\G4132 IP address (1st octet, 2nd octet) in a slave station specified is stored.
*2
Un\G4133 to
Un\G4138
System area
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