Operation Mode At Double Block Start - Mitsubishi Electric MELSEC-Q Series Programming Manual

Operation mode at double block START

This mode setting designates the operation mode which is to be effective when a block START request occurs (by block
START step (Bm , Bm
Settings and corresponding operations
Set the operation mode at block double START to either STOP or WAIT in the "block parameter" of the SFC setting dialog box
in the Tools menu.
The operations resulting from these settings are shown below.
Setting Operation
STOP • A CPU module operation error (BLOCK EXE.ERROR) occurs, and CPU module operation
is stopped.
• All "Y" outputs switch OFF.
WAIT • CPU module operation continues, and a WAIT status is established when the transition
(default) condition is satisfied. The WAIT status continues until the START destination block is
deactivated.
• A step transition occurs when the START destination block is deactivated, and that block is
then reactivated.
• If a transition WAIT occurs, the previous step is deactivated, the output is switched OFF,
and the operation output will not be executed.
• When a START request is issued to the block that is already active by execution of the following, the START
request is ignored and the processing of the SFC program is continued as is.
Block START instruction (SET BLm) of SFC control instructions
ON of Block START/END bit of SFC information devices
• For the following CPU modules, the operation mode at double block START cannot be set. The operation
mode at double block START is limited to the "WAIT" mode.
Basic model QCPU
Q00UJCPU, Q00UCPU, Q01UCPU, Q02UCP
Universal model QCPU whose serial number (first five digits) is "12051" or earlier
L02(S)CPU, L02(S)CPU-P
LCPU whose serial number (first five digits) is "15101" or earlier
• When changing a setting for the operation mode at double block START, write both SFC programs and
parameters to PLC. If both SFC programs and parameters are not written, the changed setting content may
not be reflected.
4 SFC PROGRAM CONFIGURATION
126
4.7 SFC Operation Mode Setting
)) for a block which is already started.
Remarks
A block range can be designated for the
STOP setting.