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Configuration Options with the ET 200M

3-6

Distributed I/O Device ET 200M

EWA-4NEB780600602-06

3.4.1 Time Stamping with 10 ms Accuracy

The time stamping of signal changes is supported throughout the PCS 7 system by

all the hardware and software components: from the IM 153-2 via an S7-400 to the

OS.

Prerequisite

The synchronization interval must be set to 10 seconds.

Principle

By carrying out configuration in STEP 7 you can monitor digital inputs for signal

changes in a system. The ”coming/going signal” (rising or falling edge) is

monitored. The IM 153-2 records these altered input signals with the current time

(time stamp) and stores them as message lists. A message list is a record with a

maximum of 20 messages about time-stamped signal changes. The IM 153-2 can

store up to 15 records.

After a certain time has elapsed and if there are any messages or if a record is full,

the IM 153-2 triggers a process interrupt in the DP master (S7-400). The CPU then

reads the record and forwards the message lists to WinCC in an OS using the FB

90 “IM_DRV” driver block (included in PCS 7 software package).

Sample configuration for time stamping of signal changes with IM 153-2

ET 200M

distributed I/O device

S7-400

programmable controller

Industrial Ethernet

WinCC

operator station (OS)

(system visualization)

SM 321-7BH... digital input

module

(or another module authorized

for time stamping)

PROFIBUS

Time sender

(SICLOCK)

CP 443-1

CP 443-5

(DP master)

Figure 3-4 Sample configuration for time stamping of signal changes with IM 153-2

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Siemens SIMATIC Distributed I/O System DP/ASi Link Specifiche Pagina 44