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Parameters and properties

SIPROTEC PROFIBUS-DP - Communication profile

C53000-L1840-B001-03

2.2 Execution of switching operations via PROFIBUS-DP

2.2.1 Command output modes

The following types of commands are available in the SIPROTEC device:

Double commands Execution of double commands, output to the switching devices and checkback sig-

nals are processed through two outputs respectively two bits, which are defined by

"01" = OFF and "10" = ON.

Single commands Execution of single commands, output to the switching devices and checkback signals

are processed by one output respectively one bit, which is defined by "0" = OFF and

"1" = ON.

A command output in the SIPROTEC device can be executed as continuous output or

pulse output.

Commands with

continuous output

Commands in the operation mode continuous output are executed (controlled) if in the

corresponding pair of bits a value changeover (a slope) is recognized via PROFIBUS-

DP from "Quiescent status" or OFF to ON and they remain active until a new value

changeover occurs from "Quiescent status" or ON to OFF via PROFIBUS-DP.

For the definition of the values for "Quiescent status", ON and OFF ref. to chap. 3.2

and 3.3.

Commands with

pulse output

An output of a control pulse to switch a switching device incl. monitoring of the pro-

grammed times is executed autonomously by the SIPROTEC device.

The switching operation (the pulse output via the allocated binary outputs of the

SIPROTEC device) is executed if in the PROFIBUS-DP output message the value of

the corresponding pair of bits is changed

• from "Quiescent status" or ON to OFF or from "Quiescent status" or OFF to ON con-

trolling double commands,

• from "Quiescent status" to ON controlling single commands.

Note:

In deviation to the above-written definition, control of the single and double com-

mands in the SIPROTEC device via PROFIBUS-DP is processed identically via

two bits of the PROFIBUS-DP output message.

Note:

The switching direction OFF for single commands with pulse output is not permitted

and is rejected in the SIPROTEC device.

Siemens siprotec 7SD5 Manual

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