Omron CS1W-MC221 -, Operation Manual

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Interface Specifics Section 5-4
Single Block Bits
These bits are used to execute programs one block at a time. The Single
Block Bits and Cycle Start Bits are used together.
• A single block can be executed by turning ON a Single Block Bit and then
turning the Cycle Start BIt ON and then OFF.
• When a program is being executed (i.e., the Cycle Start Bit is ON), the
corresponding Single Block Bit is checked at the start of each block; if it is
ON, the next block will be executed and program execution will be
paused.
To switch from single block execution to normal program execution, turn OFF
the Single Block Bit and then turn ON the Cycle Start Bit. The program will be
executed continuously starting from the next block. (The Program Number
Read Bit must be OFF.)
When the Single Block Bit is turned ON during Pass operation, the next block
will be completed before program execution is paused.
If the Single Block Bit is ON when decelerating with the OPTIONAL STOP
command, program execution will be paused after decelerating to a stop.
Timing Chart
Programming Example
Note Refer to the programming example for the Cycle Start Bits on page 268.
Word Task Bit I/O Valid mode
MC221 MC421
n+3 Task 1 03 Output Auto
n+5 Task 2
--- n+7 Task 3
--- n+9 Task 4
Signal Function
1 The status of a Single Block BIt is checked when the Cycle Start Bit is
turned ON and at the beginning of each block. When the bit is ON, program
execution is paused after the next block is executed.
Cycle Start Bit
(n+3, 02)
Single Block Bit
(n+3, 03)
xe-
lock.
Program execution
Cycle Start Received Flag
(n+19, 09/n+23, 09)
ON so N005 is executed as a single
block and execution will pause.
Program Number Read Bit
(n+3, 07)
OFF for continuous operation
OFF so N004 is not e
cuted as a single b