49
SM014
1min frequency cycle
30s
30s
Mark (SM20-SM22)
ID
Function
Description
SM020
Zero bit
SM020 is ON when plus/minus operation result is 0
SM021
Borrow bit
SM021 is ON when minus operation overflows
SM022
Carry bit
SM022 is ON when plus operation overflows
PC mode (SM30-SM34)
ID
Function
Description
SM030
PLC initialization
Restore PLC to factory settings
SM032
Retentive register reset
When SM032 is ON, ON/OFF mapping memory of HM, HS and current
values of HT, HC, HD will be reset.
SM033
SM034
All output forbidden
The output indicators of PLC are all off, but the output state of Y
terminal remains. If it is used for pulse output, the software will also
monitor the pulse change, but there is no output. The pulse stop sending
method is emergency stop, and the output of expansion module is also
prohibited.
Stepping ladder (SM40)
ID
Function
Description
SM040
The process is running
Set ON when the process is running
Interruption ban (SM50-SM90)
ID
Interrupt no.
Function
Description
SM050
I0000/I0001
Forbid input interruption 0
After executing EI instruction, the input
interruption couldn’t act independently when
M acts, even if the interruption is allowed.
E.g.: when SM050 is ON, I0000/I0001 is
forbidden.
SM051
I0100/I0101
Forbid input interruption 1
SM052
I0200/I0201
Forbid input interruption 2
SM053
I0300/I0301
Forbid input interruption 3
SM054
I0400/I0401
Forbid input interruption 4
……
……
……
SM069
I1900/I1901
Forbid input interruption 19
SM070
I40**
Forbid timing interruption 0
After executing the EI instruction, even if the
interrupt is allowed, when this SM acts, the
corresponding timer interrupt cannot act alone
SM071
I41**
Forbid timing interruption 1
SM072
I42**
Forbid timing interruption 2
SM073
I43**
Forbid timing interruption 3
SM074
I44**
Forbid timing interruption 4
……
……
……
SM089
I59**
Forbid timing interruption
19
SM090
Forbid all interruptions
Forbid all interruptions