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8. Step7 Read and Write Gateway Data
EP-321MP provides modules shown as follow. The maximum allowed number of modules is 64 in Step7.
The maximum allowed number of input bytes is 244, the max number of output bytes is 244 and the aggregate of
maximum number of input bytes and output bytes is 488.
Module
Consistent
4 Words Input, 4 Words Output
Word Consistent
8 Words Input, 8 Words Output
Word Consistent
24 Words Input, 24 Words Output
Word Consistent
56 Words Input, 56 Words Output
Word Consistent
1 Byte Input
Byte Consistent
1 Word Input
Word Consistent
2 Words Input
Word Consistent
4 Words Input
Word Consistent
8 Words Input
Word Consistent
16 Words Input
Word Consistent
32 Words Input
Word Consistent
64 Words Input
Word Consistent
2 Words Input Consistent
Total length Consistent
4 Words Input Consistent
Total length Consistent
8 Words Input Consistent
Total length Consistent
16 Words Input Consistent
Total length Consistent
1 Byte Output
Byte Consistent
1 Word Output
Word Consistent
2 Words Output
Word Consistent
4 Words Output
Word Consistent
8 Words Output
Word Consistent
16 Words Output
Word Consistent
32 Words Output
Word Consistent
64 Words Output
Word Consistent
2 Words Output Consistent
Total length Consistent
4 Words Output Consistent
Total length Consistent
8 Words Output Consistent
Total length Consistent
16 Words Output Consistent
Total length Consistent
As is shown above, the data modules which EP-321MP supports include: Word consistency, Byte
consistency and length consistency.
For the data modules that support Word and Byte consistency, you can use command “MOVE” to access the
data during STEP7 programing.
Summary of Contents for EP-321MP
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