Omron SYSMAC CS Series Operation Manual page 86

Specifications
Item
Execu- Function Common
tion of block exe- to all
func- cution function
tion conditions blocks
blocks
For indivi-
dual func-
tion block
Function block opera-
tion cycle
Function blocks sup-
porting high-speed
operation (Not sup-
ported for the CS1D-
LCB05D.)
LCB load rate
External I/O response cycle
54
- Operation of all function blocks by turning power ON to the PLC (Hot or cold start can
be specified.) For cold starts, function block data is transferred from flash memory to
RAM.
- Function block operation can be stopped by CX-Process Tool or FINS command.
- Hot start (state active before Board was stopped is continued before operation is
started) or cold start (all state signals and function block internally held values are
cleared before operation is started) is possible by CX-Process Tool or FINS command.
- Function block operation can be stopped and hot start (state active before Unit was
stopped is continued before operation is started) is possible CX-Process Tool or FINS
command.
Standard: Operation of all function blocks is executed at the same operation cycle pre-
set to ITEM 004 in the System Common block.
Settable operation cycles: 0.1 s, 0.2 s, 0.5 s, 1 s, 2 s (default: 1 s)
Note: Cannot be set to the same operation cycle for some function blocks.
Option: Operation of individual function blocks is executed at the same operation
cycle preset to ITEM 004 in the System Common block.
Settable operation cycles: 0.01 seconds
0.1 seconds, 0.2 seconds, 0.5 seconds, 1 second, and 2 seconds (default: 1
second)
*1: When LCB05D is used, 0.01 seconds, 0.02 seconds, and 0.05 seconds cannot be
set. The function block operation cycle must be set to a minimum of 5 times the
mounted CS1D CPU Unit's cycle time when the CS1D-CPU@@P is used.
Note: The external I/O response cycle on a single control loop does not necessarily
match the operation cycle. The response cycle is heavily dependent on the CPU
Unit's cycle time. (See the external I/O response cycle item below.)
The following operation cycles can be set for the blocks listed below: 0.01, 0.02, and
0.05 s.
Control/Operation blocks: Block Models 016, 150, 151, 155 to 157, 167, 182 to 184, 186,
and 221 to 224
Sequence control and Field Terminal blocks
Refer to note after table in 1-1-13 List of Function Blocks.
The "LCB load rate" refers to the ratio between the actually applied execution time and
preset operation cycle.
The maximum value and current value are displayed for each operation cycle group on
the CX-Process Tool.
A LCB load rate of 80% or less is required in all operation cycle groups.
When the load rate exceeds 80% for 6 seconds, the LCB load rate automatically
changes to the next longer operation cycle. (This is called the "automatic operation cycle
switching function.")
Note: The High Load Alarm Flag (A42408) turns ON if the load rate exceeds 80% for six
seconds consecutively (non-fatal Inner Board error). (If execution is not possible
within the operation cycle, the operation cycle will be extended.) If this happens,
select the function blocks that can have longer operation cycles and increase their
operation cycles. If the load rate is still too high, processing of the function blocks
must be separated for processing by additional Loop Control Units.
The time from external input of analog signals up to external output of analog signals on
a single control loop depends on the function block's operation cycle and the CPU Unit's
cycle time.
Description
*1
, 0.02 seconds
Section 1-3
*1 *1
, 0.05 seconds ,