IDEC MICROSmart FC6A Series

FC6A S ERIES MICROS MART U SER ’ S M ANUAL FC9Y-B1722 2-153
2: P RODUCT S PECIFICATIONS
Calculation Method of I/O Data Refresh Time
When expansion modules are used with the CPU module, an approximate value for the I/O data refresh time can be calculated
with the following equations.
Use the I/O data refresh time obtained with the following equations as a rough estimate.
■ When Not Using an Expansion Interface Module (FC6A-EXM2, FC6A-EXM24, FC6A-EXM1M, FC6A-EXM1S, or
FC6A-EXM1S4)
■ When Using an Expansion Interface Module (Expander) (FC6A-EXM2, FC6A-EXM24)
I/O data refresh time = ( ) module(s)
× 0.04 ms
+ ( ) module(s)
× 0.17 ms
+ ( ) module(s)
× 0.34 ms
+ ( ) module(s)
× 1.09 ms
+scan time
Digital I/O module Analog I/O module PID module Communication
module
Example:
I/O data refresh time = 4 × 0.04 ms + 2 × 0.17 ms + 1 × 0.34 ms + 0 × 1.09 ms + scan time
= 0.84 ms + scan time
I/O data refresh time = ( ) module(s)
× 0.08 ms
+ ( ) module(s)
× 0.29 ms
+ ( ) module(s)
× 0.58 ms
+ ( ) module(s)
× 1.09 ms
+scan time
Digital I/O module Analog I/O module PID module Communication
module
Example:
I/O data refresh time = 7 × 0.08 ms + 5 × 0.29 ms + 1 × 0.58 ms + 2 × 1.09 ms + scan time
= 4.77 ms + scan time
Plus CPU Module Analog I/O Modules
PID Module
Digital I/O Modules
Plus CPU Module
Analog I/O Modules Communication
Modules
Digital I/O Modules
PID Module
Expansion Interface Module
(Expander) (FC6A-EXM2, FC6A-EXM24)