COTRUST CTH200 Series - Ext_Mem Library Function Explanation

Appendix
180
You can see new ext_mem library under directory tree “Libraries” after installation.
【Call ext_mem library】
Click “Network” to add a function block, then double-click “ReadExtVMem” and “WriteExtVMem”
to get the function block in “Network”. As the following figure:
C.3 Ext_mem library Function Explanation
【Use ReadExtVMem to read data from expansion data space】
Parameter
address
Explanation
Type
Value range
Note
Ptr
Memory address pointer
to read
DWord
Such as:
&VB0,&IB0
Offset
Read starting offset
address in expansion
memory
DWord
0-102399
Len
Read memory
length(byte )
DWord
Err
Return value indicate if it
read successfully
BYTE
0 means read
successfully
others fail.