Issue 01/06

Parameter Description

P2019[8] CI: PZD to COM link (USS)

 

Min:

0:0

CStat:

CT

Datatype: U32

Unit: -

Def:

52:0

P-Group:

COMM

Active: Immediately

QuickComm.: No

Max:

4000:0

Selects signals (process data PZD) to be transmitted to serial interface via USS on COM link

Level

3

r0052

P2019

 

 

 

 

r0052

[0]

 

 

 

 

r0021

[1]

 

 

 

 

 

[2]

 

 

 

 

r0053

[3]

 

 

 

 

r0053

.

 

 

 

 

 

.

PZD4

PZD3

PZD2

PZD1

 

.

 

[7]

ZSW2

 

HIW

ZSW1

STX

Start of text

LGE

Length

ADR

Address

PKW

Parameter ID value

PZD

Process data

BCC

Block check character

ZSW

Status word

HIW

Main actual value

P2012

BCC

 

PZD

PKW

 

ADR

 

LGE

 

Process data

Parameter

 

 

 

 

 

 

 

 

 

 

USS telegram

STX

PZD mapping from parameter P2019 USS on COM link

Index:

P2019[0] : Transmitted word 0

P2019[1] : Transmitted word 1

P2019[2] : Transmitted word 2

P2019[3] : Transmitted word 3

P2019[4] : Transmitted word 4

P2019[5] : Transmitted word 5

P2019[6] : Transmitted word 6

P2019[7] : Transmitted word 7

Details:

See P2016 (PZD to BOP link)

r2024[2]

USS error-free telegrams

 

Min:

-

Level

 

Datatype: U16

Unit: -

Def:

-

3

 

 

 

P-Group: COMM

 

Max:

-

 

Displays number of error-free USS telegrams received.

Index:

r2024[0] : Serial interface COM link

r2024[1] : Serial interface BOP link

r2025[2] USS rejected telegrams

 

Min:

-

Level

 

Datatype: U16

Unit: -

Def:

-

3

 

 

 

P-Group: COMM

 

Max:

-

 

Displays the number of rejected USS telegrams. The sum of all USS errors (r2026 - r2031) is displayed in parameter r2025.

The following monitoring mechanisms have been implemented

-when a telegram is received, then initially, the correct start of a telegram (start interval + STX) must be identified and then the length must be evaluated (LGE). If the length does not correspond to the selected value for a fixed telegram or it does not have a valid value for a variable telegram length, the telegram is rejected.

-the appropriate times are monitored before and while receiving telegrams.

-the block check character (BCC) is generated while the telegram is received and after the complete telegram has been read-in, this is compared with the received BCC. If these do not match, then the telegram is not evaluated.

-if a character frame error or a parity error has not occurred in any of the received characters, then the node number (ADR) of the received telegram can be evaluated.

-the telegram is rejected if the address byte (ADR) does not correspond to the node number (for slave) or the expected slave node number (for the master).

Index:

r2025[0] : Serial interface COM link

r2025[1] : Serial interface BOP link

MICROMASTER 440

Parameter List

6SE6400-5BB00-0BP0

201

Page 201
Image 201
Siemens 440 manual P20198 CI PZD to COM link USS, R20242 USS error-free telegrams, R20252 USS rejected telegrams