Omron CVM1 Series, Operation Manual

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16
Component Names and Functions Section 2-3
Level/Link Setting
• When configuring a single-level PC Link system, set pin 3 to ON. The set-
ting of pin 4 is disabled when pin 3 is ON, but set pin 4 to ON as well.
• When configuring a multi-level PC Link system, set pin 3 to OFF and set
the Link number with pin 4. (A maximum of four levels is possible.) The
setting of pin 4 is disabled when pin 3 is ON, but set pin 4 to ON as well.
For details on the Link number setting, refer to
3-3-4 Setting the Level/
Link Number .
• Set the same Level/Link setting on all of the PC Link Units in the same
operating level.
Note The setting of pin 4 is disabled in this case, but set pin 4 to ON.
Note Do not set the same Level/Link setting on two PC Link Units in the same PLC.
The Unit will not detect an error, but there will be data errors in the LR Area
The Level/Link settings determine how many of PC Link Units can be
mounted in a PLC. One Unit can be mounted with single-level operation and
one or two Units can be mounted with multi-level operation.
Number of LR Bits The number of LR bits setting (and max. number of Units in the level) is set on
the level’s polling node (node 0).
It isn’t necessary to set the number of LR bits on the polled nodes (Units with
node addresses other than 0). The settings are disabled in the polled nodes.
Note If an invalid setting is set for single-level operation, the number of
LR bits will be set to 512 bits (2 Units max.).
If an invalid setting is set for multi-level operation, the number of LR
bits will be set to 256 bits (2 Units max.).
Pin settings Level/Link number
3 4
1 --- (See note.) Single-level operation
0 1 Multi-level operation, Link #1
0 0 Multi-level operation, Link #0
Pin settings Single-level operation Multi-level operation
6 7 8 Number of LR
bits
Max. number
of Units
Number of LR
bits
Max. number
of Units
0 0 0 32 bits (2 words) 32 32 bits (2 words) 16
0 0 1 64 bits (4 words) 16 64 bits (4 words) 8
0 1 0 128 bits (8 words) 8 128 bits (8 words) 4
0 1 1 256 bits (16 words) 4 256 bits (16 words) 2
1 0 0 512 bits (32 words) 2 Invalid settings (See note.)
1 0 1 Invalid settings (See note.)
1 1 0
1 1 1