Siemens 440 - Manual (Page 201)

Issue 01/06 Parameter Description
MICROMASTER 440 Parameter List
6SE6400-5BB00-0BP0
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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
P2012
.
.
.
PZD1
ZSW1
PZD2
HIW
PZD3 PZD4
ZSW2
[0]
P2019
[1]
[2]
[3]
[7]
STX
LGE
ADR
PKW
PZD
BCC
ZSW
HIW
r0021
r0052
r0052
r0053
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
3
Level
3
Level
3