Preface-4
FC5A MicroSmart User’s Manual FC9Y-B1268
Slim Type CPU Module Instruction Execution Time
Execution times of some instructions have been reduced on slim type CPU modules with Logic Engine version 200 or
higher and system program version 210 or higher as shown below.
Instruction
Conditions for Reduced Execution Time
Execution Time (µs)
New
Old
TML, TIM, TMH, TMS
T0 through T127 with preset values designated by constants
0.389
17
CC=, CC
Preset values designated by devices valid for Logic Engine
0.111
8
DC=, DC
Data register numbers and preset values designated by devices valid for Logic
Engine
0.167
8
ADD (W, I)
Without repeat designation, and S1, S2, and D1 designated by devices valid
for Logic Engine
0.278
44
SUB (W, I)
60
Note 1:
Devices valid for Logic Engine are constants, data registers D0 through D1999, special data registers D8000 through D8399,
timer/counter preset values, and timer/counter current values.
Note 2:
The new instruction execution time applies to FC5A-D12K1E and FC5A-D12S1E regardless of its system program version.
If the control system performance is affected by the reduced scan time, the scan time can be adjusted using the constant scan time
(D8022, 1 to 1,000 ms). For details about constant scan time, see page 5-50. The DISP or DGRD instruction may not operate correctly
due to the reduced scan time. If this is the case, adjust the scan time using the constant scan time (D8022, 1 to 1,000 ms), as
required. For minimum scan times required for the DISP and DGRD instructions, see pages 10-1 and 10-3 (Advanced Vol.).
Logic Engine version is found in the lower right corner of the label on the side of the slim type CPU module. To confirm the system
program version of the MicroSmart CPU module, use WindLDR on a computer connected with the CPU module. The system program
version is indicated on the PLC Status dialog box. See page 13-1.
Phone: 800.894.0412 - Fax: 888.723.4773 - Web: www.clrwtr.com - Email: [email protected]
