8.Assignment and function of SM special storage area
SMB0 Always_On
SM0.0 Always ON
First_Scan_On
SM0.1 ON for the first scan cycle only SM0.4 30 seconds OFF,30 seconds ON SM0.5 0.5 second OFF,0.5 second ON
Clock_60s Clock_1s
SMB1
Set to 1 by the execution of certain instructions when the operation result = 0 Set to 1 by exec. of certain instructions on overflow or illegal numeric value. Set to 1 when a math operation produces a negative result
Result_0
SM1.0
Overflow_Illegal SM1.1
Neg_Result
SM1.2
Divide_By_0
SM1.3 Set to 1 when an attempt is made to divide by zero
Set to 1 when the Add to Table instruction attempts to overfill the table Set to 1 when a LIFO or FIFO instruction attempts to read from an empty table Set to 1 when an attempt is made to convert a non-BCD value to a binary value Set to 1 when an ASCII value cannot be converted to a valid hexadecimal value
Table_Overflow
SM1.4
Table_Empty
SM1.5
Not_BCD
SM1.6
Not_Hex
SM1.7
The PLC variables addresses of LCD keys: F1 → SM191.0 F2 → SM191.1 F3 → SM191.2 F4 → SM191.3
ESC
→ → → → → →
SM190.0 SM190.1 SM190.2 SM190.3 SM190.4 SM190.5
OK UP
DOWN LEFT
RIGHT
When the value of SM192.0 is equal to 1,LCD will be bright. When the value of SM192.0 is equal to 0,LCD will be dark. SMW22-SMW26 Scan time (millisecond)
220
Made with FlippingBook - Online magazine maker