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1. Ethernet 4-29
Network Communications
Read
Read Words from PLC Memory
int HKEtn_ReadPlcMemory(WORD *dp,unsigned short Wordcnt,int
DeviceType,DWORD addr,char *lpAddr, int DFlag=1)
This function is retained until PLC data is transferred from the V7 series.
• Parameters
*dp Target pointer of the data to be read
Wordcnt Word count to be read (max. 2000 words)
DeviceType Address of the device to be read (Refer to “Chapter 5 Connection to
PLCs.”)
addr Top memory address to be read
For YOKOGAWA or YASKAWA PLCs, specify a number “−1” for the
address (addr).
Example: D400 → 399 D25 → 24
*lpAddr IP address shown as a string of characters separated by dots
Example: “192.168.XXX.XXX”
DFlag 0, 1, 2 (Refer to the table below.)
• Return values
Success TRUE
Failure FALSE
Error details Get using HKEtn_GetLastError ().
• Priority and communication procedure depending on the DFlag setting are shown
below.
Contents Word Count
No. 1 1
No. 2 1
•
•
•
•
•
•
No. n 1
DFlag Priority Communication Procedure
0 Communications
1 Display
2 Display
PC
Read/write request
V7
PLC
Memory card
Response
Acknowledge of completion
Response
PC
Read/write request
V7
PLC
Memory card
Acknowledge of completion