Precautions For Dedicated Instructions - Mitsubishi Electric Melsec Q Series User Manual

8
DEDICATED INSTRUCTIONS

8.1 Precautions for Dedicated Instructions

(1) Before executing a dedicated instruction
Before executing a dedicated instruction, be sure to confirm the following.
(a) Turn ON the Data consistency start request signal (Y0C)
(b) Check that Consistency is disabled with Autom. Refresh enabled.
(2) The BBLKRD and BBLKWR instructions must be used in pair
Use the BBLKRD and BBLKWR instructions as a pair, and always execute them once
for every sequence scan.
If only one of these instructions is used, an error code is stored in the Local station
error information area (Un\G23071). (
Before executing a dedicated instruction, turn ON the Data consistency start
request signal (Y0C).
Attempting to execute a dedicated instruction with the Data consistency start
request signal (Y0C) OFF will result in non-processing (non-execution).
Use the Data consistency requesting signal (X0C) as an interlock for execution of
dedicated instructions.
Execution command
Figure 8.1 Interlock Example for Dedicated Instruction
If the automatic refresh and data consistency functions are enabled, use of
dedicated instructions is not allowed. (They are not processed.)
Dedicated instructions are executable if the data consistency function is disabled
in the automatic refresh setting. (
Figure 8.2 Data Consistency in Automatic Refresh
8.1 Precautions for Dedicated Instructions
Section 6.3)
Make sure the checkbox is unchecked.
Section 9.5.6)
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