Siemens ET 7Y Series Spezifikationen PDF herunterladen (Seite 168)

Cycle and Response Times

9-4

ET 200S IM 151-7 CPU Interface Module

A5E00058783-04

User program scanning time:

The user program scanning time is made up of the sum of the execution times for the

instructions and SFCs called. These execution times can be found in the instruction

list. You also have to multiply the user program scanning time by an interface

module-specific factor.

In the IM 151-7 CPU, this factor depends on the following:

Table 9-3 Dependency of the user program scanning time

Dependency

Range

The number of modules inserted 0 to 63

You can calculate the factor for your application approximately using the following

rule of thumb for the IM 151-7 CPU:

1.1

+ 0.005 x number of modules

= Multiplier for your user program

Delay of the inputs and outputs

You have to take into account the following delay times, depending on the

expansion module:

 For digital inputs: The input delay time

 For digital outputs: Negligible delay times

 For analog inputs: Cycle time of the analog input

 For analog outputs: Response time of the analog output

Extending the cycle by nesting interrupts

Table 9-4 shows typical extensions of the cycle time through nesting of an

interrupt. The program runtime at the interrupt level must be added to these. If

several interrupts are nested, the corresponding times need to be added.

Table 9-4 Extending the cycle by nesting interrupts

Interrupts

IM 151-7 CPU

Process interrupt 500 µs

Diagnostic interrupt 600 µs

Time-of-day interrupt 400 µs

Delay interrupt 300 µs

Watchdog interrupt 150 µs

Status interrupt/update interrupt/manufacturer-specific

interrupt

600 µs

Programming/access error/runtime system error 400 µs

1 2 ... 163 164 165 166 167 168 169 170 171 172 173 ... 213 214

Keine Kommentare

Siemens ET 7Y Series Spezifikationen Seite 168