CP443-5 EXT做主站，下挂DP从站，在做程序的时候，需不要调用FC1（DP send）和FC2（DP receive）吗？
最佳答案
1、CP443-5 不像CP343-5 那样，主站即可通过分配的地址直接访问子站：
硬件组态完成后，主站即可通过分配的地址直接访问子站了（直接用读/写指令）。.即·：
No special FBs or FCs are necessary for the DP mode. The interfacing to the
distributed peripheral I/O is by direct I/O access or using SFCs/SFBs of the CP。
2、有CP443-5使用功能块：
Notice
For the SFCs 11, 12, 13, 51, 55, 56, 57, 58, 59 and 103 and for SFBs 52 and 53,
several calls are necessary. The duration of job processing depends on the load,
bus round trip time and the transmission rate. If these SFCs are called in a loop
within one cycle, the cycle time could be exceeded.
Exceptions:
SFC51 requires only one call if it is used for reading the diagnostic data in a
diagnostic interrupt (SFC51 with parameter ’partial system status list’ 0xB1 and
0xB2).
Only one call is necessary for SFB54 (receive alarm with SFB54 ”RALRM”).
Blocks for DPV1 (according to the PNO standard)
1)
:
SFB52 RDREC ”Read data record from a DP slave” corresponds to SFC59
SFB53 WRREC ”Write data record to a DP slave” corresponds to SFC58
SFB54 ALARM ”Read alarm information from a DP slave
2、相关文档：
CP443-5手册，下载：
http://www2.ad.siemens.com.cn/download/Upload/AS/manual/8777196.pdf
<S7-300400的系统软件和标准功能>下载：
http://www2.ad.siemens.com.cn/download/Upload/AS/manual/1023.pdf
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已阅，最佳答案正确。
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