Delta RMC151 - Manual (Page 360)

RMC70/150 and RMCTools User Manual
5.14.2.4. ADDR_OFS Function
ADDR_OFS(location, i)
Returns the address of the ith register after location. This function is intended only for use
with the COPY function.
Parameters
Location (Address)
The address of the register location.
i (DINT)
The offset, in 32-bit registers, from the location.
Return Value
Returns the address of the ith register after the register location. This address cannot be
used directly, but is intended to be passed into one of the COPY function’s parameters.
Remarks
The ADDR_OFS function can be used to calculate an address from a base address and an
offset when using the COPY function. For example, if the first tag in the block is called
MyFirstTag, then the address of a tag located 4 registers after MyFirstTag can be
calculated with:
ADDR_OFS(MyFirstTag, 4)
The ADDR_OF function is especially useful when copying from large blocks of data that
are not declared as arrays because it lends itself well to looping and calculating addresses
during each loop. However, best programming practice is usually to set up the data in
arrays, and use the COPY function on those arrays, which makes the ADDR_OFS
unnecessary.
The Address parameter may not be a local variable. Therefore, the ADDR_OFS function
may not be used in User Functions.
Examples
See the COPY function for an example.
5.14.2.5. ASHR Function
ASHR(a, n)
Shifts the bits in a to the right n times. The sign bit is shifted in on the left.
Parameters
a (DINT or DWORD)
The value to shift.
n (DINT)
The number of times to shift a. n must be between 0 and 31.
Return Value
Returns the same data type as a.
Remarks
The result of an invalid n is undefined.
340 Delta Computer Systems, Inc.