s
SIMATIC
Serial Interface Module ET 200S 1SI
Sample program for the USS protocol
Edition 08/2005
A5E00508747-01
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Copyright Siemens AG 2005 A5E00508747-01
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Contents
1 2
Description ..................................................................................................................... 1-1 Prerequisites .................................................................................................................. 2-1 2.1 2.1.1 2.1.2 2.1.3 3 4 5
Installation of the ET 200S 1SI USS sample program..................................... 2-2 Installation of the sample program...................................................................2-2 Integration of the sample program....................................................................2-2 Adjusting the sample program to suit your HW configuration..........................2-3
Description of the program...........................................................................................3-1 Broadcast........................................................................................................................ 4-1 Control of the ET 200S FCs via Variable Tables.........................................................5-1 5.1 5.1.1 5.2 5.2.1 5.3 5.3.1 5.4 5.5 5.6
Variable table - "USS_Control".........................................................................5-1 Content of the "USS_Control" variable table....................................................5-3 Variable table - "NetData".................................................................................5-3 Content of the "NetData" variable table............................................................5-5 Variable table - "Communication_Crtl".............................................................5-6 Content of the "Communication_Ctrl" variable table........................................5-7 Variable table - "Control"..................................................................................5-8 Variable table - "Parameter".............................................................................5-9 Variable table - "DB10".....................................................................................5-9
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Contents
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1 Description
This manual uses a sample program to explain the control of an ET 200S 1SI
module via the FC17, FC18 and FC19 function blocks of the ET 200S 1SI module. Further information regarding the USS protocol can be found in the manual: SIMATIC, Serial Interface Module ET 200S 1SI, A5E00124881-04.
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1-2
Description
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2 Prerequisites
The following hardware components are required for the operation of the ET 200S 1SI module in the example:
• SIMATIC S7-300 or SIMATIC S7-400 with integrated Profibus DP interface. Alternatively, you can also use an ET 200S IM151-7 CPU. • ET 200S system with the IM151 interface module (unnecessary if an ET 200S IM151-7 CPU is used) with a PM-E DC24V power module and a 6ES7 193-4CC20-0AA0 terminal module. • ET 200S 1SI module 6ES7 138-4DF11-0AB0 USS Master and
6ES7 193-4CB20-0AA0 terminal module as well as the 6ES7 193-4JA00-0AA0 bus termination (part of the IM151). • Siemens Micromaster 420 drive control with motor (or MM3, MM4,
SINAMICS G110 USS or a suitable purchased part that supports the USS Slave protocol)
The following software prerequisites must be satisfied:
• STEP 7 Version 5.2 or higher, Service Pack 1 or higher plus the Hardware Support Package (HSP_58). The download is made from the HW Config in STEP 7 directly. The correct link is preset there. • The sample program for the ET 200S 1SI module and the function blocks are available at the following Internet address:
The ET 200S 1SI module must already be set up for operation in order to run the sample program. The parameter assignment of the ET 200S 1SI module is discussed in connection with the sample program below.
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2.1
2.1.1
Installation of the ET 200S 1SI USS sample program
Installation of the sample program
• The sample program is installed on your PC during the setup of the ET 200S 1SI module.
2.1.2 Integration of the sample program
• In the SIMATIC Manager select File > Open Project > Sample projects to open the sample project "zXX21_12_1SI_USS" and then copy all of the blocks in the "Blocks" folder to the corresponding "Blocks" folder of your project. • Change the hardware configuration to suit the hardware that you are using or
have available.
2-2
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2.1.3 Adjusting the sample program to suit your HW configuration
• Open the HW Config for your program and double-click on the ET 200S 1SI
module. In the dialog box click on the "Parameter" tab.
• Set the interface parameters (interface type, Baud rate, stop bits and parity) to suit those of your USS Slave device. Click on "OK" and close the "Properties – 1SI USS Master" dialog box. • Save and compile your HW Config project (click on the icon in the toolbar)
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• Open the HW Config for your program and read the starting address of the ET 200S 1SI module. In this sample it is 256.
• Enter this address in your program in the first line in OB100.
2-4
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Prerequisites
• Save the OB100 and download all of the blocks to the CPU.
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3 Description of the program
Further information can be found in the manual: SIMATIC, Serial Interface Module
ET 200S 1SI, A5E00124881-04.
OB100:
• In OB100, the FC19 (S_USSI) is called. This FC creates and initializes all of the
data blocks (network data DB (DB100), parameter assignment DB (DB50) and
communications processor DB (DB10)) that are required for the operation of the
ET 200S 1SI USS Master module. These DBs are not included with the sample
program. They are generated by the CPU directly.
• Furthermore, this FC performs all of the other initializations necessary for the
operation of the USS.
OB1:
• The OB1 cyclically calls the USS_Processing (FC20).
FC20:
• Processes the USS send and receive data.
- Send: The FC17 (S_USST) handles the transmission of the network data
(PZD and any PKW data) to the slaves in accordance with the network
data structure used. The FC17 handles all of the actions required by the
USS Master send protocol. The transmission of the network data to the
slave is initiated with FB3 (S_SEND).
Receive: The FC18 (S_USSR) handles the receipt of the network data
(PZD and any PKW data) from the slaves in accordance with the network
data structure used. The FC18 handles all of the actions required by the
USS Master receive protocol. The transfer of the network data from the
slave is initiated with FB2 (S_RCV). -
Notes regarding the DBs 10, 50 and 100
The DBs DB10 (communications processor DB), DB50 (parameter DB) and DB100
(network data DB) are created by the CPU directly during start-up (STOP/RUN
transition of the CPU) by a call made by FC19 in OB100. They are therefore not
normally a part of the sample project. These DBs were copied into the sample
project from the CPU (ONLINE) afterwards.
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3-2 Description of the program Serial Interface Module ET 200S 1SI - sample program for the USS protocol
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4 Broadcast
In broadcast mode, the USS Master sends a frame to all of the slaves on the bus.
In this case the "Broadcast Bit" in the address byte is set to a logical "1" (Bit5 in the
address byte of the US frame) in the request frame.
The use of the broadcast frame requires additional definitions on the application
level (joint frame length and allocation of user data to user numbers etc.).
Once these prerequisites are satisfied and before calling FB S_SEND, overwrite
the slave address with
// ------------------------
// SEND with Instance-DB
// ------------------------
L B#16#20 // set bit5 -> broadcast-addr
T DB10.DBB 13 // Transfer to send addr in // the communication DB
CALL "S_SEND", "IDB_S_SEND"
until the request has been completed or the S_SEND has returned a DONE.
Note
For USS slaves, the broadcast mechanism is NOT MANDATORY. Check the
manual for the particular USS slave that you are using to determine whether it
supports broadcast mode. While doing so, pay particular attention to the joint
frame length and the assignment of user data etc.
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4-2 Broadcast Serial Interface Module ET 200S 1SI - sample program for the USS protocol
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5 Control of the ET 200S FCs via Variable
Tables
When you copied the blocks of the sample program, you also copied six variable
tables. A summary of all of the data relevant for the sample can be found in the
variable table "USS_Control". With the aid of this variable table, you can learn
about the control of the ET 200S 1SI module via the FCs 17, 18 and 19 as well as
FB 2 and FB 3. After gaining experience with these, you should be able to integrate
these FCs and FBs into your user program and to use them to control the
ET 200S 1SI module.
5.1 Variable table - "USS_Control"
In this variable table, the control signals of the ET 200S 1SI are supplied by FC17
via the network data DB, DB100, and the status signals of the ET 200S 1SI are
displayed by FC18. The communications DB, DB10, supplies information regarding
the state of the communications.
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The variable table "USS_Control" has the following structure:
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5.1.1 Content of the "USS_Control" variable table
Motor control:
• MW22 is used to start and stop the motor. If it is set to the hexadecimal value
W#16#047F, the motor will be started. If it is set to the hexadecimal value
W#16#047E, the motor will be stopped.
• MW24 is used to specify the nominal frequency. If it set to the hexadecimal
value W#16#4000, the motor will turn at 100 % of the reference frequency. If it
set to the hexadecimal value W#16#2000, the motor will turn at 50 % of the
reference frequency.
PKW request:
• Using the flag words 30, 32, 34 and 36, you can define a PKW request. The
user program enters the values into the current PKW request area in the
network data DB (DB100). FB S_USST transfers the PKW data to the
associated PKW send area in DB100 and initiates the transfer in the
communication processor DB (DB10). The thus prepared transmit data is sent
to the slave by FB S_SEND via the ET 200S 1SI module
-
-
-
- PKE: The type of request and parameter-ID (e.g. 0x1438 to query the minimum frequency (P1080) ) from the slave (Micromaster) IND: Index PWE1: Parameter value 1 PWE2: Parameter value 2
Communication state:
• The flags DB10.DBX0.0 – DB10.DBX1.0 provide information regarding the
current communication state. These flags show send and receive requests and
any communication errors. DB10.DBW 6 shows the duration of the last cycle
and DB20.DBW 8 shows the length of the send telegram/frame.
Send/Rcv state:
• Display possible error messages
-
-
- MB50 – FC 19: S_USSI MW52 – FB3: S_SEND state and MW56 – FB2: S_RCV state
5.2 Variable table - "NetData"
The transmission of data as well as reactions or answers from the USS_Slave can
be examined in the variable table "NetData ". Here you find the current PKW
requests as well as the send and receive buffers for the PKW/PZD data:
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5.2.1 Content of the "NetData" variable table
Current PKW request:
• The user program enters a PKW request with the corresponding request
identification (parameter read/write) as well as the parameter-ID (e.g. P1080)
and parameter values (PWE1/PWE2).
Transmit buffer:
• PKW area: an outstanding PKW request is copied from the "current PKW
request" to this area by S_USST and then sent with the next send telegram.
• PZD area: In this area, you find the process data to be sent
Receive buffer:
• PKW area: The FB S_USSR transfers the data sent back by the slave - in
response to a PKW request - into this area.
• PZD area: FB S_USSR puts the data sent back by the slave - in response to a
PZD request - in this area.
Further information regarding the structure of the network data DB, slave-related
communication data, buffers for the current PKW request as well as the structure
of the send and receive buffers can be found in the manual: SIMATIC, Serial
Interface Module ET 200S 1SI, A5E00124881-04, Chapter 3.8.7.
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5.3 Variable table - "Communication_Crtl"
This variable table can be considered a continuation of the previous variable table
"USS_Control". The difference between this and the former is that this table
presents a more detailed view of the state of the communication together with the
most important control signals. For information regarding the additional control
signals, please see the ET 200S 1SI manual, Chapter 3.8.9 Communications
Processor DB.
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5.3.1 Content of the "Communication_Ctrl" variable table
Send receive states:
• The flags DB10.DBX0.0 – DB10.DBX1.0 provide information regarding the
current communication state. These flags show send and receive starts and any
communication errors. DB10.DBW 6 shows the duration of the last cycle and
DB20.DBW 8 shows the length of the send telegram.
Request state:
• In this section, you will find information regarding the state of the request such
as e.g. the maximum number of cycles while waiting to receive.
Further information regarding the communications processor DB and the meaning
or use of the communication state DBW0 can be found in the manual: SIMATIC,
Serial Interface Module ET 200S 1SI, A5E00124881-04, Chapter 3.8.9.
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5.4 Variable table - "Control"
This variable table contains communication control flags, the communication
control word and the communication status word from the network data DB
(DB100). These flags signal the current status of the USS transmission and are
stored in the network data DB (DB100).
Status words can be used to precisely monitor the communication, while the
control word allows you to precisely control the beginning of a parameter
assignment request.
Further information regarding the network data DB and the meaning and use of the
status and control words can be found in the manual: SIMATIC, Serial Interface
Module ET 200S 1SI, A5E00124881-04, Chapter 3.8.7.
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5.5 Variable table - "Parameter"
The parameter DB DB50 is generated by FC19 at every new start-up (STOP/RUN
transition of the CPU) and is stored in the CPU - overwriting the prior values. In this
DB, the system parameters as well as the communication parameter are set for
each USS slave that is connected.
Further information regarding the structure of the parameter DB, the system
parameters and the parameter assignment of the slaves can be found in the
manual: SIMATIC, Serial Interface Module ET 200S 1SI, A5E00124881-04,
Chapter 3.8.8.
5.6 Variable table - "DB10"
The variable table "DB10" is used to monitor the data traffic between the CPU and
the serial interface module ET 200S Modbus/USS. Further information can be
found in the variable table or the manual: SIMATIC, Serial Interface Module
ET 200S 1SI, A5E00124881-04.
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5-10 Control of the ET 200S FCs via Variable Tables Serial Interface Module ET 200S 1SI - sample program for the USS protocol
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