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5 MODULE DEDICATED INSTRUCTION
5.4 Network Dedicated Instruction
*1 Local devices and file registers per program cannot be used as setting data.
*2 In addition to the setting data, the ZNRD instruction is executed using the following fixed values.
Channel used by host station: Channel 1
Arrival monitoring time (monitoring time until instruction completion): 10 seconds
Number of resends for arrival monitoring timeout: 5 times
Processing details
This instruction reads data from devices of a programmable controller CPU on another station. (In units of words)
• Specify devices of the target station's CPU within the range allowed for the host station CPU when reading
data from the devices with the ZNRD instruction.
(Target station's start device number (s1) where data to be read are stored) + (Read points - 1)
(End device
No. of host station's CPU
*3
)
• Specify the host station's start device number (d1) within the range allowed for storing read data.
(Example) When D150 and after the area in the host station's CPU has been already used
*3 End device No. of the device in the host station CPU, and whose device name is same as in (s1)
D50
D0
D99
D0
D99
100 words
100 words
D100
D150
D199
D149
D150
Host station CPU
Other station CPU
Host station CPU
Other station CPU
: Data to be read with ZNRD instruction
: Area already used by host station CPU
: Duplicated area
Good example (D50 is specified in ( ).)
Bad example (D100 is specified in ( ).)
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