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DMC-3425 Chapter 7 Application Programming• 127
XQ _ED3,_ED1,1 Skip invalid command
ENDIF
EN End of command error routine
Example – Ethernet Communication Error
This simple program executes in the DMC-3425 and indicates (via the serial port) when a
communication handle fails. By monitoring the serial port, the user can re-establish communication if
needed.
Instruction
Interpretation
#LOOP Simple program loop
JP#LOOP
EN
#TCPERR Ethernet communication error auto routine
MG {P1}_IA4
Send message to serial port indicating which handle
did not receive proper acknowledgment
RE
Mathematical and Functional Expressions
Mathematical Operators
For manipulation of data, the DMC-3425 provides the use of the following mathematical operators:
Operator Function
+ Addition
- Subtraction
* Multiplication
/ Division
& Logical And (Bit-wise)
|
Logical Or (On some computers, a solid vertical line
appears as a broken line)
() Parenthesis
The numeric range for addition, subtraction and multiplication operations is +/-2,147,483,647.9999.
The precision for division is 1/65,000.
Mathematical operations are executed from left to right. Calculations within parentheses have
precedence.
SPEED=7.5*V1/2
The variable, SPEED, is equal to 7.5 multiplied by V1 and
divided by 2
COUNT=COUNT+2 The variable, COUNT, is equal to the current value plus 2.
RESULT=_TPA-(@COS[45]*40)
Puts the position of A - 28.28 in RESULT. 40 * cosine of
45° is 28.28
TEMP=@IN[1]&@IN[2] TEMP is equal to 1 only if Input 1 and Input 2 are high