IDEC MICROSmart FC6A Series, User Manual

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2: P
RODUCT
S
PECIFICATIONS
2-120 FC6A S
ERIES
MICROS
MART
U
SER
’
S
M
ANUAL
FC9Y-B1722
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-EXM1M, or FC6A-EXM1S)
■
When Using an Expansion Interface Module (Expander) (FC6A-EXM2)
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)