Specifications

Appendix 5 Ethernet App5-31
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 2” to “Chapter 33.”)
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