Mitsubishi MELSEC-Q Series User Manual page 155

4 SET-UP AND PROCEDURE BEFORE OPERATION
IP address
210.99.88.00
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(b) Mask bit length
Set the valid bit length of the set IP address. (Setting range: 1 to 32)
(c) Action
Set the action (pass/block) to be taken when the received IP packet meets
the filter setting condition.
(Example) When the IP address is set to "210.99.88.00", the action becomes
valid in the following IP address range.
Mask bit length
16
24
(3) IP filter operation
(a) The IP filter is executed in ascending order of the filter setting numbers.
(b) When the received IP packet meets the filter setting condition, the action
(pass/block) is executed for the received IP packet.
(c) When the received IP packet does not meet all filter setting conditions, the
action (pass/block) set in the access setting is executed.
IP packet received
Does IP packet
meet the condition of filter
Does IP packet meet the
condition of filter setting No. 2?
Does IP packet meet the
condition of filter setting No. 32?
Is the condition of access
Action IP address range where access is blocked
210.99.00.00 to 210.99.255.255
Block
210.99.88.00 to 210.99.88.255
setting No. 1?
(Action: Block)
NO
(Action: Pass)
NO
(Action: Block)
NO
setting "Block"?
NO
Pass
YES
Block
YES
Pass
YES
Block
YES
Block
MELSEC-Q
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