Mitsubishi Electric MELSEC-Q Series Programming Manual page 66

If another block is started by the parallel processing operation, the START source block and START destination block will be
executed simultaneously. (In the example below, processing from step "n+1" will be executed simultaneously with block 1.)
The following table indicates the number of steps that can be executed simultaneously in all blocks and the maximum number
of active steps in a single block. If the number of simultaneously processed steps exceeds the value in the following table, an
error occurs and the CPU module stops processing.
CPU module type
Basic model QCPU
High Performance model QCPU
Process CPU
Redundant CPU
Universal Q00UJCPU, Q00UCPU, Q01UCPU, Q02UCPU
model QCPU
Q03UDCPU, Q03UDVCPU, Q03UDECPU, Q04UDHCPU,
Q04UDVCPU, Q04UDEHCPU, Q06UDHCPU, Q06UDVCPU,
Q06UDEHCPU, Q10UDHCPU, Q10UDEHCPU, Q13UDHCPU,
Q13UDVCPU, Q13UDEHCPU, Q20UDHCPU, Q20UDEHCPU,
Q26UDHCPU, Q26UDVCPU, Q26UDEHCPU, Q50UDEHCPU,
Q100UDEHCPU
LCPU L02SCPU, L02SCPU-P, L02CPU, L02CPU-P
L06CPU, L06CPU-P, L26CPU, L26CPU-P, L26CPU-BT, L26CPU-
PBT
4 SFC PROGRAM CONFIGURATION
64
4.3 Transition
When condition "b" is satisfied at step "n" execution, processing will proceed to step "n+1" and block 1
will be started. Blocks "0" and "1" will then be processed simultaneously.
Number of steps
that are processed
simultaneously
1024 steps
1280 steps
1024 steps
1280 steps
1024 steps
1280 steps
Maximum number of active steps
in one block
128 steps
256 steps
128 steps
256 steps
128 steps
256 steps