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Host Link Function for Replacing Existing PLCs Section 4-6
Note For pre-Ver. 1.2 Units, the number of words that can be read and written per
frame (i.e., the text lengths) when using C-mode commands is different for C-
series Host Link Units and CS/CJ-series Serial Communications Boards/
Units. A host computer program previously used for C-series Host Link Units
may not function correctly if it is used in CS/CJ-series PLCs. When using
Serial Communications Boards/Units with Unit Ver. 1.2 or later, these pro-
grams can be reused by setting the Host Link compatible device mode to
mode C (C500/120) or mode D (D200H). (Alternatively, check the host com-
puter program before using it and make any corrections required to handle dif-
ferent frame text lengths. Refer to the CS/CJ-series Communications
Commands Reference Manual (W342) for details.)
4-6 Host Link Function for Replacing Existing PLCs
An enhanced Host Link function is provided to enable reuse of host computer
programs created for the existing PLC. By selecting the 1:N/1:1 Host Link pro-
tocol and the Host Link compatible device mode according to the existing PLC
model, the Board/Unit’s Host Link functions can be fully compatible with the
Host Link of the existing PLC.
4-6-1 Support for 1:1 Host Link
Pre-Ver. 1.2 Units
The C200H-LK101/201/202, C500-LK101/201/103/203, and C120-LK101/
201/202 Host Link Units for earlier C-series PLCs (C200H and C500) enable
selection of either 1:1 or 1:N Host Links. The CS/CJ-series and later PLCs,
however, only support 1:N Host Links. Therefore, the host computer programs
created using 1:1 Host Link protocol cannot be reused in CS/CJ-series PLCs.
CVM1 or CV-
series CPU Units
CVM1/CV-CPU@@ No changes have been made
in wiring.
It may be possible to use the host computer
programs without alteration as long as the
same communications settings (e.g., baud
rate) are used. It may be necessary, however,
to change programs to allow for different CS/
CJ command specifications.
CVM1 or CV-
series Host Link
Unit
CV500-LK201
Previous
products
Model number Changes required for CS/CJ-series product
Wiring Other
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