Omron SYSMAC CS1W-LCB01 Operation Manual page 162

Description of Operation
Note
Note
Relationship between
inter-function block
connections and
operation cycle
Note
128
The execution cycle of sequence commands in the Step Ladder Program
block depends on the operation cycle of the Step Ladder Program block
(Block Model 301) itself. So, the operation cycle is slower than the execution
cycle (cycle time) of commands on the CPU Unit. For this reason, the Step
Ladder Program block is used in combination with other function blocks.
When high-speed processing is required, use commands on the CPU Unit.
Logic sequence only
STEP 00
STEP 00
LOAD 001013
AND 002012
OUT 100-020
The minimum resolution (accuracy) of the step timer of the Timer block (Block
Model 205), ON/OFF Timer block (Block Model 206), and the Step Ladder
Program block (Block Model 301) is the same as the operation cycle set to
ITEM004.
Even if data connections are made between function blocks having different
operation cycles, the inputs and outputs of each function block are refreshed
according to the operation cycle of the local node.
Block A
Operation
Analog signal
cycle: a sec.
For example, if the output of function blocks having an operation cycle of 0.1
seconds is connected to function blocks having an operation cycle of one sec-
ond, the 1-second function blocks accept data after 10 operations of the 0.1
second function blocks.
Even if the operation cycles are synchronized, the order of operation of the
function blocks does not necessarily match the connection order in the soft-
ware wiring. (In the above example, function block B does not necessarily fol-
low function block A.) For details, see 3-2-16 Order of Operations below.
User link tables are downloaded from the CX-Process with the shortest oper-
ation cycle of any of the connected blocks.
Logic sequence and step sequence
STEP 00
STEP 00
Operation cycle
LOAD 001013
AND 002012
OUT 100-020
STEP n
STEP n
LOAD NOT 010020
JUMP 000n
STEP TIMER
Block B
In the figure on the left, block A updates
and outputs analog signals at an operation
Operation
cycle of a seconds, whereas block B inputs
cycle: b sec.
the analog signals at an operation cycle of
b seconds.
Section 3-2
Operation cycle