Data transfer via communication ports
734
Part
III F
P
Instructions
1. Setting the communication parameters (see)
2. Generating the data in the send buffer
To generate the data in the send buffer, define a variable in the program and copy the data to the send buffer
using a transfer instruction, e.g. F10_BKMV (see page 819).
The storage area for the data to be sent starts with the second word of the send buffer (offset 1). Offset 0
contains the number of bytes to be sent.
1
Storage area for the number of bytes to be sent
2
Storage area for the data to be sent
0
1
2
n
Offset
2
1
3
4
2n
2n-1
Bold numbers indicate the order of transmission.
The maximum volume of data that can be sent is 2048 bytes.
EXAMPLE
Define a send buffer for 30 bytes (ARRAY [0...15] OF WORD) and copy 8 characters of a string ("ABCDEFGH")
into the buffer.
Send buffer layout:
0
1
2
4
16#42(B)
16#41(A)
16#44(D) 16#43(C)
16#48(H) 16#47(G)
16#46(F)
16#45(E)
8
3
Offset
15
The first word of the send buffer (offset 0) is reserved for the number of bytes to be sent. Therefore, copy the
data into offset 1 (
SendBuffer[1])
.
When sending begins (the execution condition for F159_MTRN (see page 741) turns to TRUE), the value in
offset 0 is set to 8. At the end of transmission, the value in offset 0 is automatically reset to 0. The data in offset
1 to offset 4 is sent in order from the low order byte.
Содержание FP Series
Страница 27: ...Chapter 1 Basics ...
Страница 60: ...Chapter 2 Data transfer instructions ...
Страница 62: ...Chapter 3 Arithmetic instructions ...
Страница 88: ...Chapter 4 Bitwise Boolean instructions ...
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Страница 94: ...Chapter 5 Bit shift instructions ...
Страница 100: ...Bit shift instructions 99 Part II IEC Instructions LD ...
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Страница 104: ...Chapter 6 Comparison instructions ...
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Страница 114: ...Chapter 7 Conversion instructions ...
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Страница 254: ...Chapter 8 Selection instructions ...
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Страница 262: ...Chapter 9 String instructions ...
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Страница 306: ...Chapter 11 Bistable instructions ...
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Страница 316: ...Chapter 13 Counter instructions ...
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Страница 342: ...Chapter 15 Arithmetic instructions ...
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Страница 362: ...Arithmetic instructions 361 Part III FP Instructions LD ST IF DF start THEN F36_DINC increment_value END_IF ...
Страница 384: ...Arithmetic instructions 383 Part III FP Instructions LD ST IF DF start THEN F37_DEC decrement_value END_IF ...
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Страница 433: ...Arithmetic instructions 432 Part III FP Instructions ST IF start THEN F88_DABS abs_value END_IF ...
Страница 449: ...Arithmetic instructions 448 Part III FP Instructions LD ST IF DF start THEN F85_NEG negotiate_value END_IF ...
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Страница 512: ...Chapter 17 Bitwise Boolean instructions ...
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Страница 622: ...Chapter 20 Conversion instructions ...
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Страница 712: ...Chapter 22 Data transfer via communication ports ...
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Страница 786: ...Chapter 23 Data transfer via network ...
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Страница 806: ...Chapter 24 Data transfer within the PLC ...
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Страница 884: ...Chapter 27 Edge detection instructions ...
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Страница 914: ...Chapter 29 Timer instructions ...
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Страница 938: ...Chapter 30 Process control instructions ...
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Страница 970: ...Chapter 31 FP e display instructions ...
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Страница 980: ...Chapter 32 System register instructions ...
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Страница 998: ...Chapter 33 Special instructions ...
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Страница 1008: ...Chapter 34 Program execution control instructions ...
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Страница 1134: ...Chapter 37 GT panel instructions ...
Страница 1138: ...Chapter 38 High speed counter instructions ...
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Страница 1246: ...Chapter 40 Appendix Programming Information ...
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