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description
date values DATE#1996-12-25, D#1996-12-25
time of day TIME_OF_DAY#12:42:50.92, TOD#12:42:50.92
date and time DATE_AND_TIME#1996-12-25-12:42:50.92, DT#1996-12-25-12:42:50.92

examples

Figure 19.9 Time and Date Examples

• Basic math functions include,

plc st -19.8
:= assigns a value to a variable
+ addition
- subtraction
/ division
* multiplication
MOD(A,B) modulo -this provides the remainder for an integer divide A/B
SQR(A) square root of A
FRD(A) from BCD to decimal
TOD(A) to BCD from decimal
NEG(A) reverse sign +/-
LN(A) natural logarithm
LOG(A) base 10 logarithm
DEG(A) from radians to degrees
RAD(A) to radians from degrees
SIN(A) sine
COS(A) cosine
TAN(A) tangent
ASN(A) arcsine, inverse sine
ACS(A) arccosine -inverse cosine
ATN(A) arctan -inverse tangent
XPY(A,B) A to the power of B
A**B A to the power of B

Figure 19.10 Math Functions

• Functions for logical comparison include,

> greater than >= greater than or equal = equal <= less than or equal < less than <> not equal

Figure 19.11 Comparisons

plc st -19.9

• Functions for Boolean algebra and logic include,

AND(A,B) logical and OR(A,B) logical or XOR(A,B) exclusive or NOT(A) logical not ! logical not

Figure 19.12 Boolean Functions

• The precedence of operations are listed below from highest to lowest.

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