Delta EtherCAT User Manual

EtherCAT Programming Guide Operating MRAM on PAC
March, 2017 30-5
30
30.4 _ECAT_Master_MRAM_Read_DWord_Data
 Syntax
U16 PASCAL _ECAT_Master_MRAM_Read_DWord_Data(U16 CardNo, U32 Index, U32
DataNum, U32 *Data)
 Purpose
Read the U32 data (DWord) from the specified address of MRAM in PAC.
Note: Delta MH1 and MP1 series PAC provide 128K byte retentive memory space. The API allows Double
Word type data to access the retentive memory. Index 0 will occupy byte 0, byte 1, byte 2 and byte 3, index
1 occupies byte 2, byte 3, byte 4 and byte 5 and so on. The memory will conflict with the index space, thus,
when the index value is odd, error will occur.
 Parameter
Name Data type Property Description
CardNo U16 Number Card number
Index U32 Value
Range: 0 ~ 65535
Odd numbers are not allowed.
DataNum U32
Quantity
Data number to be wrote into the memory
Data U32*
Data array
Data array to be wrote into the memory

Example
U16 Status = 0;
U16 CardNo = 16;
U16 data [3] = {0};
// Read data from the last three data space of retentive memory.
U32 Index=65530, DataNum=3;
Status= _ECAT_Master_MRAM_Read_DWord_Data(CardNo, Index, DataNum, data);

Delta EtherCAT Specifications

General

Brand	Delta
Model	EtherCAT
Category	Control Systems
Language	English