Siemens SIMATIC S7-200 Руководство для водителя - Страница 4
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Siemens S7-200 Driver
Setup
The maximum number of supported channels is 256. The maximum number of devices supported per
channel is 127.
Supported Communication Parameters
Baud Rate: 9600 or 19200
Parity: Even (11-bit mode) and None (10-bit PPM mode)
Data Bits: 8
Stop Bits: 1
Note: Not all devices support the listed configurations.
Ethernet Encapsulation
This driver supports Ethernet Encapsulation, which allows the driver to communicate with serial devices
attached to an Ethernet network using a terminal or device server. It may be invoked through the COM ID in
Channel Properties. For more information, refer to the main server's help documentation.
Communication Protocols
Point-to-Point (PPI) S7-200 Communications Protocol (11-bit mode).
Point-to-Point Modem (PPM) S7-200 Communications Protocol (10-bit mode).
The Siemens S7-200 Driver normally operates using the standard 11-bit PPI protocol. If the EM 241 modem
module is required, the S7-200 PPM model must be selected. This model allows the driver to operate in a 10-
bit mode that is compatible with many off-the-shelf modems. The 10-bit PPM mode can also be used directly
on the PLC's programming port. To enable 10-bit PPM mode, set the S7-200 programming cable to 10-bit
mode.
Flow Control
When using an RS232/RS485 converter, the type of flow control that is required depends on the needs of the
converter. Some converters do not require any flow control and others require RTS flow. Consult the
converter's documentation to determine its flow requirements. An RS485 converter that provides automatic
flow control is recommended.
Note: When using the manufacturer's supplied communications cable, it is sometimes necessary to
choose a flow control setting of RTS or RTS Always under the channel properties.
Supported Devices
Siemens S7-200 devices
Supported Cables
A special cable is required to communicate with the S7-200 PLC. The cable recommended by the
manufacturer should be used.
See Also:
Device Properties
Channel Properties
This server supports the use of simultaneous multiple communications drivers. Each protocol or driver used
in a server project is called a channel. A server project may consist of many channels with the same
communications driver or with unique communications drivers. A channel acts as the basic building block of
an OPC link.
The properties associated with a channel are broken in to logical groupings. While some groups are specific
to a given driver or protocol, the following are the common groups:
www. ptc.com
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