Siemens 440 User Manual

Page 201

Issue 01/06

Parameter Description

MICROMASTER 440 Parameter List
6SE6400-5BB00-0BP0

201

P2019[8]

CI: PZD to COM link (USS)

Min: 0:0

CStat:

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

P2012

PZD1

ZSW1

PZD2

HIW

PZD3

PZD4

ZSW2

[0]

P2019

[1]
[2]
[3]

[7]

STX
LGE

ADR

PKW

PZD
BCC
ZSW
HIW

r0021

r0052

r0053

Start of text
Length

Address
Parameter ID value
Process data
Block check character

PZD mapping from parameter P2019

USS on COM link

USS telegram

STX

LGE

ADR

BCC

PKW

PZD

Process data

Parameter

Status word
Main actual value

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: -

Datatype: U16 Unit:

Def:

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: -

Datatype: U16 Unit:

Def:

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

Level