Schneider Automation Modicon Quantum Ethernet Informations techniques télécharger pdf (Page 69)

3/16

Modicon M580 automation

platform

Ethernet Modbus/TCP network

Performance

Application response time (continued)

I/O Scanning service response time

The response time RT includes the time between taking account of information from

a remote input and updating the state of a remote output. It includes the processing

time in the PLC.

This response time RT consists of the following parameters:

v TMod In and TMod Out: Response time of the read/written device, excluding the

electrical transition time at the input/output (TMod depends on the device, usually

between 1 and 8 ms)

v TIOS In and TIOS Out: Time between 2 read/write operations on the same device

(0.3 ms

x number of devices scanned), at least equivalent to the congured scan

time

As TIOS is executed in parallel with the PLC cycle, it can be hidden from the

viewpoint of the response time RT.

v Cycle T: PLC scan cycle time

v TNet: Propagation time on the network (depends on the application, but usually

TNet = 0.05 ms at 10 Mbps and 0.005 ms at 100 Mbps)

The response time RT can be estimated using the following 3 formulae:

b RT

min

, minimum response time with TIOS hidden and 1 PLC scan cycle:

b RT

typic

, typical response time with 0.5 TIOS hidden:

b RT

max

, maximum response time with TIOS not hidden:

min

= (TMod In + 0) x TIOS In + (Tnet + N) x cycle T + (0 x TIOS Out) + Tnet + TMod Out

typic

(TMod In + 0.5) x TIOS In + (Tnet + N) x cycle T + (0.5 x TIOS Out) + Tnet + TMod Out

max

= TMod In + TIOS In + (Tnet + N) x T cycle + TIOS Out + Tnet + TMod Out

Performance (continued)

I/O Scanning service response time

Device 1

Device 2

Manager

Hub

Input

Output

Ethernet Modbus/TCP

Response time (RT)

Input

Output

TMod In

TMod Out

TIOS In

TNet

N x Cycle T

TIOS Out

TNet

Processors:

page 1/18

I/O architectures:

page 2/2

Software:

page 4/2

Ruggedized Modicon M580

modules: page 5/2

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Schneider Automation Modicon Quantum Ethernet Informations techniques Page 69

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