Siemens Simatic S7-200 System Manual page 47

Follow these steps:
1. In the MPI Network tab, select a number in the Local Station Address box. This number
indicates where you want STEP 7-Micro/WIN to reside on the programmable controller
network.
2. Make sure that the Not the Only Master Active check box is cleared, regardless of the
number of masters you have on your network. If the check box contains a check mark,
click the box to clear it. Be sure to connect the communication cable between the
programming device and the CPU before initiating communications. If you start
communications before connecting the programming device to the existing CPU network
including one or more master devices, then communications are disrupted while the
network is being reinitialized.
3. Select a value in the Timeout box. This value represents the length of time that you want
the communications drivers to spend to attempt to establish connections. The default
value should be sufficient.
4. Set the transmission rate at which you want STEP 7-Micro/WIN to communicate over the
network. Because you are probably using the DP port on a CPU 215, you can select any
available transmission rate up to 12 Mbaud. See Chapter 9, Table 9-1, for valid baud
rates for your CPU module.
5. Select the highest station address. This is the address where STEP 7-Micro/WIN stops
looking for other masters on the network.
6. Click the "OK" button to exit the Setting the PG/PC Interface dialog box.
Troubleshooting the MPI Communications Setup for 16-Bit Applications
The MPI Card option activates the MPI drivers in the S7DPMPI.INI configuration file, which
was placed in the Windows directory during the STEP 7-Micro/WIN installation.
If you get an interrupt error, you must set the MPI card to a free hardware interrupt request
(IRQ) line. The default interrupt line is IRQ 5. The IRQ field is used to specify the interrupt
number used by the MPI card. An interrupt error indicates that IRQ 5 is already in use. To
specify a different IRQ line, follow these steps:
1. Select the menu command Setup
box is displayed. Locate the hardware interrupt options and choose an alternate value.
2. Accept your changes by clicking "OK" or pressing ENTER. The software automatically
modifies the S7DPMPI.INI file, and informs you if exiting the application is required.
3. Restart the STEP 7-Micro/WIN application and select the MPI option again.
Note
The following are the default addresses for the S7-200 CPU modules with more than one
communication port:
CPU 215
CPU 216
S7-200 Programmable Controller System Manual
C79000-G7076-C230-02
Installing and Using the STEP 7-Micro/WIN Software
Communications.... The communications dialog
Port 0: 2
Port 1: 126
Port 0: 2
Port 1: 2
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