ICS T8314C Trusted TMR 24 Vdc Digital Input 4 Input

The Output Module time is based on the number of Trusted High Density Output Modules.
The time calculations are independent of the number of channels on each Module (i.e. a 32
channel 120 Vdc Digital Output Module has the same output Module scan time as a 40
channel Analogue Output Module). The Output Module time is calculated by multiplying the
“Scan Factor” by 2, adding the result to a constant, then multiplying by the total number of
High Density Output Modules.

Scan Factor No. Input Modules Input Total
( ( x 2 ) + 7.6 ms ) x
While the Output Module time may seem disproportionately long when compared to the
Input Module time based solely on the number of modules, Output Modules are accessed
twice during each cyclical period: once to provide input data to the application (such as
channel state, voltage, and current), and again when controlling the outputs themselves.2
4.8.4. Application Execution
The Application Execution time is based on the estimated size of the application. While
actual application size varies greatly based on numerous factors, an estimation of the
application size can generally be calculated based on the number of I/O points in a system.
The Application Execution time is calculated by adding a constant overhead factor to the
total number of I/O modules, then multiplying by a constant time factor.

The Composite Scan time is the sum of the Central Module time, Input Module time, Output
Module time, and the Application Execution time.
Central Module Total
Input Module Total
Output Module Total
Application Execution Total
Composite Scan Time
The default configuration is for all outputs to be updated each scan, irrespective of a change
of state (or value). If the Trusted System is configured to update outputs only when they
change, the Output Module time calculation is as follows: [ (Scan Factor + 4.5 ms) x No.
Output Modules ] + [ (Scan Factor + 3.1) x DeltaOM ], where “DeltaOM” represents the
average number of Output Modules with at least one channel that will change state (or
value) with each composite scan time and is at least 1 for any system that contains at least 1
Output Module.

The Input Module time is based on the number of Trusted High Density Input Modules. The
time calculations are independent of the number of channels on each Module (i.e. a 60
channel DUAL Module has the same Input Module time as a 40 channel TMR Module). The
Input Module time is calculated by multiplying a time factor by the total number of High
Density Input Modules. Digital and analogue Modules have the same time factor.
The Input Module time may be reduced by setting individual modules to scheduled polling
in their entry in the System.INI configuration. As an approximation, this will reduce their
scan time effect in proportion to their poll interval.

The Output Module time is based on the number of Trusted High Density Output Modules.
The time calculations are independent of the number of channels on each Module (i.e. a 32
channel 120 Vdc Digital Output Module has the same output Module scan time as a 40
channel Analogue Output Module). The Output Module time is calculated by multiplying a
time factor by the total number of High Density Output Modules.
The Output Module time may be reduced by setting individual modules to scheduled polling
in their entry in the System.INI configuration. This spaces out the read operations from the
module. As an approximation, this will reduce two-thirds of their scan time effect in proportion to their poll interval. The remaining time is due to write operations to the
module. Selecting ‘write by exception’ in the entry in the System.INI configuration will
prevent write operations if the outputs have not changed.

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