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FINS Commands Section 5-3
Using Host Link
Communications
When a FINS command is sent using Host Link communications, the Host
Link header, response wait time, destination node address, and source node
address are all placed before the command format, and the frame check
sequence (FCS) and terminator are placed after the command format before
sending the command from the host computer.
Execution Conditions
The Execution Conditions tables given for each command tell whether the
CPU Unit can or cannot receive commands when it is in RUN, MONITOR, or
PROGRAM mode, when another device has the access right, when command
protection is in effect, and when the DIP switch is protected.
Access Right at Other
Device
The Access right at other device column tells whether the CPU Unit can or
cannot receive a command when another device has the access right to the
CPU Unit.
Note The access right is the exclusive right of access to a particular device (the
CPU Unit in this case) which prevents interruption by another device (i.e.,
another Peripheral Device or Unit) when multiple commands are executed.
When another device has the access right, the local device cannot execute
commands marked by a “No” in the “Access right at other device” column.
Conversely, other devices cannot execute this command when the local
device has the access right.
UM Read Protection
The UM read protection column tells whether the CPU Unit can or cannot receive
the command when UM (user memory) is protected from a Peripheral Device.
DIP Switch UM write
Protection
The DIP switch UM protection column tells whether the CPU Unit can or can-
not receive a command when UM is write-protected by turning ON pin 1 of the
DIP switch on the CPU Unit’s front panel.
Network Write Protection The Validate FINS Write Protection via Network parameter in the PLC Setup
can be used to set whether the CPU Unit will accept or reject network com-
mands.
5-3-2 MEMORY AREA READ: 01 01
Reads the contents of the specified number of consecutive memory area
words starting from the specified word.
Execution Conditions
Command Format
Response Format
Access right at
other device
UM read
protection
DIP switch UM write
protection
Network write
protection
OK OK OK OK
RUN mode MONITOR mode PROGRAM mode
OK OK OK
I/O Memory area code
No. of items
(binary)
Command
code
01 01
Beginning address
End codeCommand
code
01
01
Data (for number of items)
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