一位高人发了个邮件没收到,请高手再发个S7-200查表指令应用实例.我的邮箱;wzw1965222@yahoo.com.cn
最佳答案
STL
NETWORK 1 // Create table with 20 entries starting with memory location VW4
LD SM0.1 // On the first scan,
MOVW +20 VW0 // define maximum length of table
NETWORK 2 // Reset table with input I0.0
LD I0.0 // On the rising edge of I0.0,
EU
FILL +0 VW2 21 // fill memory locations from VW2 with "+0"
NETWORK 3 // Write value to table with input I0.1
LD I0.1 // On the rising edge of I0.1,
EU
ATT VW100 VW0 // copy value of memory location VW100 to table
NETWORK 4 // Read first table value with input I0.2
// Moves the last table value to location VW102. This reduces the number of entries.
LD I0.2 // On the rising edge of I0.2,
EU
LIFO VW0 VW102 // Move last table value to memory location VW102
NETWORK 5 // Read last table value with input I0.3
// Moves the first table value to location VW102. This reduces the number of entries.
LD I0.3 // On the rising edge of I0.0,
EU
FIFO VW0 VW104 // Move first table value to memory location VW104
NETWORK 6 // Search table for first location that has a value of "10"
// In order to search the entire table, the index (VW106) must set to 0 before doing the find.
// If a match is found then the index will have the table entry number, but if
// no match is found then the index will match the current entry count for the
// table (VW2).
LD I0.4 // On the rising edge of I0.4,
EU
MOVW +0 VW106 // reset index pointer
FND= VW2 +10 VW106 // find a table entry that equals 10
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