Mitsubishi Electric MELSEC iQ-R Series - Page 93

3 DETAILS OF FUNCTION
3.2 MELSEC iQ-R Series Data Link Functions
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3
mdrRandR
This function reads devices randomly.
■ Format
short mdrRandR(long lPath, short sRoute, long lNetNo, long lIoNo, long lStNo, short sCPU, long* plDev, short* psBuf, long
lBufSize)
■ Argument
The specification method of the randomly selected device (plDev) is as follows:
■ Description
• This function reads devices specified to the randomly selected device (plDev) from a module specified to the network
number (lNetNo), the start I/O number (lIoNo), the station number (lStNo), and the CPU number (sCPU).
• The read data is stored in the read data storage destination (psBuf) in word units in order of the specification to the
randomly selected device (plDev). A bit device is stored per 16 points, a word device is stored per 1 point, and a double-
word device is stored in word units.
• Specify so that the total number of read points specified for each block is 10240 points or less. Otherwise, a size error (-5)
will occur.
• Communication time varies significantly depending on the contents specified to the randomly selected device (plDev).
To reduce communication time, use the mdrReceive function.
• To access the own station, set the station number to 255. When the actual station number is used, an error will occur.
Argument Name Description IN/OUT
lPath Path of channel Specify the path of the opened channel. IN
sRoute Access route Specify the access route to target module.
• 0: CC-Link IE Controller Network
• 1: CC-Link IE Field Network
•2: MELSECNET/H
• 3: CC-Link
• 4: Bus interface
IN
lNetNo Network number Specify the network number of target module.
Page 14 Argument specification
IN
lIoNo Start I/O number Specify the start I/O number divided by 16 of the target module.
Page 14 Argument specification
IN
lStNo Station number Specify the station number of target module.
Page 14 Argument specification
IN
sCPU CPU number Specify the target CPU number.
• 0: Control CPU specification
• 1 to 4: Multiple CPU specification
IN
plDev Randomly selected device Specify the number of blocks, device type, start device number, and points of
devices to be read.
IN
psBuf Read data storage destination Specify the storage destination (address) of read data. OUT
lBufSize Read data storage destination size Specify the size of area reserved in the read data storage destination in byte
units.
IN
Specification
position
Description Block
plDev[0] Number of blocks 
plDev[1] Device type Block 1
plDev[2] Start device number
plDev[3] Number of read points
plDev[4] Device type Block 2
plDev[5] Start device number
plDev[6] Number of read points
 
plDevLst[3n+1] Device type Block n
plDevLst[3n+2] Start device number
plDevLst[3n+3] Number of read points