Omron SYSMAC CS Series User Manual

169
Duplex Operation of Loop Controllers Section 3-5
3. Duplex initialization is executed in a cold start. The CS1D system will enter
duplex mode after the duplex initialization has been completed (150 sec-
onds max.)
4. The active Loop Controller's operation cycle will be temporarily lengthened
by 3 seconds max.
3-5-3 Restrictions on Duplex Loop Controllers
Effect on CPU Unit Cycle Times
Effect on CPU Unit Normal
Cycle Times
The following table shows the time added to the CPU Unit's normal cycle time
by the Loop Controllers in the Process-control CPU Unit.
Example of Process-control CPU Unit’s Influence on Normal Cycle Time
Note (a) The influence of the function block and user link table operation
cycle on the CPU Unit’s cycle time is greatest when the function
block and user link table operation cycle is 100 ms.
(b) The influence of the Process-control CPU Unit Loop Controllers
on the CPU Unit’s cycle time is greatest when the cycle time of
the CPU Unit is 19 ms.
(c) When sequence tables are used, the extra time in the above table
is further extended. The additional extra time required depends
on how the sequence tables are used, as follows:
• Not expanding sequence tables: +3 ms
• Expanding sequence tables vertically or horizontally: +6 ms
• Expanding sequence tables both vertically and horizontally:
+12 ms
The extended cycle time will not be lengthened if the number of ex-
panded sequence tables increases, but the number of times that
the cycle time is extended will increase.
Effect on CPU Unit Cycle
Time and Loop Controller
Operation Cycle during
Duplex Initialization
Refer to page 41.
Restrictions on Minimum
Operation Cycle for Loop
Controller Function
Blocks
When using Process-control CPU Unit (CS1D-CPU@@P), it is recommended
that the longest possible operation cycle is set to prevent operation cycle
errors. The operation cycle time for Loop Controller function blocks must be a
minimum of 5 times the CPU normal cycle time (i.e., the cycle time other than
when duplex initialization is being executed).
Loop Controller model Time added to normal cycle time
CS1D-CPU@@P25 ms max.
Function block and user link table opera-
tion cycle (See note (a).)
100 ms
Number of function blocks 100 150 200
Number of user link tables 100 150 200
Load rate 39 55 71
Influence (ms) by 2-ms cycle time of ladder
program (See note (b).)
+7.8 +10.5 +13.6
Influence (ms) by19-ms cycle time of lad-
der program (See note (b).)
+10.3 +14.4 +20.8

Omron SYSMAC CS Series Specifications

General

Brand	Omron
Model	SYSMAC CS Series
Category	Controller
Language	English