Siemens EF 83H Series Uživatelský manuál stáhnout pdf (Strana 180)

Specifications

C-1

SIMATIC 505 PROFIBUS-FMS CP User Manual

Appendix C

Specifications

able C-1

Communication

Capacities

Communication Type Maximum Number or Size

FMS Connections 32

FDL Connections 32

S7 Connections 48

Total number of connections 59 (or 60 if Peerlink service is not used)

FMS variable size Maximum PDU size = 241 bytes

237 bytes for Read jobs (241 – 4 bytes)

≤234 bytes for Write and Information Report jobs,

depending on name length, index or subindex (see

Table C-2)

Send-Receive data size 240 bytes

Peerlink data transfer size 234 bytes

able C-2

provides a formula for calculating the maximum size of an FMS

variable that can be transmitted. The maximum PDU size for an FMS job is

241 bytes. For W

rite and Information Report jobs, the PDU includes the

addressing information, which must then be subtracted from 241 bytes to

determine the maximum amount of data that can be specified in the

variable.

able C-2

Calculating V

ariable Length

Access Using... Write or Information Report

Index 8 bytes

Subindex 10 bytes

Name x + name length (number of characters)

x = 7 for name length ≥

x = 6 for name length < 15

Example: For

a variable named “PumpControl” (name length = 1

1), which

is less than 15 characters, add 6 to the name length and subtract from 241,

as shown below:

241 – (x + name length)

241 – (6 + 1

241 – 17 = 224 bytes of user data

1 2 ... 175 176 177 178 179 180 181 182 183 184 185 186 187

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