3-12
3.7 Precautions on Programming
3.7.1 Precautions on assigning a name
Table 3.7-2 Reserved words (2/2)
Category Character string
Standard function block
name
Function block names in application functions such as CTD, CTU
Symbol ", %, ', ~, ^, ¦, @, [, ] , {, }, ;, :, , , ., ?, \, !, #, $, ', _, *, /, +, <, >, =, &, (, ), -
Date and time literal DATE, DATE_AND_TIME, DT, TIME, TIME_OF_DAY, TOD
Others
ACTION, END_ACTION, CONFIGURATION, END_CONFIGURATION, CONSTANT, F_EDGE, R_EDGE, AT, PROGRAM,
WITH, END_PROGRAM, TRUE, FALSE, READ_ONLY, READ_WRITE, RESOURCE, END_RESOURCE, ON, TASK,
EN, ENO, BODY_CCE, BODY_FBD, BODY_IL, BODY_LD, BODY_SFC, BODY_ST, END_BODY, END_PARAMETER_SECTION,
PARAM_FILE_PATH, PARAMETER_SECTION, SINGLE, TRUE, FALSE, RETAIN, INTERVAL, L, P
String that starts with K1
to K8
Such as K1AAA
Address Such as %IX0
Statement in ladder
language
;FB BLK START, ;FB START, ;FB END, ;FB BLK END, ;FB IN, ;FB OUT, ;FB_NAME;,INSTANCE_NAME,
;FB, ;INSTANCE
Common instruction Such as MOV
Windows reserved word
COM1, COM2, COM3, COM4, COM5, COM6, COM7, COM8, COM9, LPT1, LPT2, LPT3, LPT4, LPT5, LPT6, LPT7, LPT8, LPT9,
AUX, CON, PRN, NUL
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