Siemens SIMATIC Distributed I/O System DP/ASi Link Manuel de service télécharger pdf (Page 118)

C-2

Distributed I/O System DP/ASi Link

EWA 4NEB 710 6055-02b

C.1 Structure of the Parameterization Message in Configuring with Ad-

dress Optimization

The parameterization message contains 140 bytes of data, bytes 0 to 139.

These 140 bytes comprise:

 7 bytes in accordance with the DP standard, bytes 0 to 6, refer to

Table C-1

 8 bytes for initialization of the DP/ASi link, bytes 7 to 14, refer to

Table C-4

 a control byte, byte 15, refer to Table C-5

 4 bytes in each case for a possible ASi slave, bytes 16 to 139, refer to

Table C-6

You will find the structure of the seven bytes conforming to the DP standard

in Table C-1.

Table C-1 Structure of the DP standard part in parameterization message

Byte(s) Value Meaning

0 Station status, refer to Table C-2

1 0 to 255

Watchdog factor

These two bytes represent two factors for response moni-

toring. If the DP master fails, the DP slave is reset at the

end of the response time (T

). All the outputs are set to

0 b h DP/ASi li k

2 0 to 255

0 by the DP/ASi link.

You calculate the response time from the formula:

+watchdog time base

factor 1

(byte 1)

fac-

tor 2

(byte 2)

3 0 to 255 Response delay

The response delay specifies the length of time the DP

slave has to wait until it can send its response message to

the DP master. The response time depends on the baud

rate.

4, 5 32795 =

801B

Manufacturer ID

The manufacturer ID is a product-specific ID. The DP/

ASi link accepts in the parameterization message only

that manufacturer ID which corresponds to its own. If the

ID in the parameterization message is not identical with

that of the DP/ASi link, an error message is issued.

Structure

DP standard part

Parameterization Message

1 2 ... 113 114 115 116 117 118 119 120 121 122 123 ... 151 152

Commentaires sur ces manuels

Pas de commentaire

Siemens SIMATIC Distributed I/O System DP/ASi Link Manuel de service Page 118

Commentaires sur ces manuels

Produits connexes et manuels pour Non Siemens SIMATIC Distributed I/O System DP/ASi Link