Siemens SIMATIC S7-200, Системное руководство, Страница: 426 / 866

Communication
8.5 PROFIBUS
S7-200 SMART
426
System Manual, V2.3, 07/2017, A5E03822230-AF
8.5.1.3 Configuring the EM DP01
Procedure
1. To use the S7-200 SMART EM DP01 PROFIBUS DP module as a DP device, you must
set the station address of the DP port to match the address in the configuration of the
DP master. The station address is set with the rotary switches on the EM DP01.
2. You must power cycle the S7-200 SMART CPU after you have made a switch change in
order for the new DP device address to take effect.
Result
The DP master device exchanges data with each of its DP devices by sending information
from its output area to the DP device's output buffer. The DP device responds to the
message from the DP master by returning an input buffer which the DP master stores in an
input area.
Configuration steps
The S7-200 SMART EM DP01 PROFIBUS DP module can be configured by the DP master
to accept output data from the DP master and return input data to the DP master. The output
and input data buffers reside in the variable memory (V memory) of the S7-200 SMART
CPU. When you configure the DP master, you define the byte location in V memory where
the output data buffer starts as part of the parameter assignment information for the
EM DP01. You also define the I/O configuration as the amount of output data to be written to
the S7-200 SMART CPU and amount of input data to be returned from the S7-200 SMART
CPU. The EM DP01 determines the size of the input and output buffers from the I/O
configuration. The DP master writes the parameter assignment and I/O configuration
information to the EM DP01. The EM DP01 then transfers the V memory address and input
and output data lengths to the S7-200 SMART CPU. These values are available in the
special memory (SM) of the S7-200 SMART CPU for use in the user program. Refer to the
SM status information in "User program considerations" (Page 435) for further details.