西门子S7系列串口通讯模块的信息与使用7.常见问题:S7300 PLC对通讯数据的读写
日期：2008-3-20 19:03:00 来源： 作者：51plcjs 点击：
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如何在ET200M从站上添加一个插有硬件Dongle（如Modbus Master）的CP341模板，实现S7300 PLC对通讯数据的读写？
How can I load a loadable driver (e.g. CP PtP MODBUS Master) into a CP 341 that is connected to a high-availability system by means of the ET 200M?
ANSWER:
In order to expand the functions and adapt the CP 341 to the communication partner, other transmission protocols can be loaded onto the CP, in addition to the standard protocols.
The following basic requirements must be fulfilled in order to load drivers into a CP 341 subsequently.
There must be a version of STEP 7 Base V4.02 or higher installed.
There must be a version of the Point-to-Point Couplings Parameterization (CP PtP Param) options package V4.1 or higher installed. The latest version of this software is available to download from the Internet as freeware under Entry ID: 12310504.
Plug the dongle which comes with the driver into the back of the CP.
The loadable driver has to be configured in the 'CP-PtP Param' parameterization user interface first of all. Once this has been configured, the configuration and parameterization data can be loaded online from the PG into the CPU via the 'Load target system' menu command.
In order to load the loadable MODBUS driver in the S7-400 high-availability system into the CP 341 on the ET 200M, both high-availability CPUs must be switched to 'STOP' mode.
The driver is then loaded directly from the PG into the EPROM on the CP 341 via the MPI interface on the master CPU. For this reason, module exchange is not possible without a PG!
This loading process can also take place in a S7-300 central rack via an S7-300 CPU. The CP is then plugged into the ET 200M.
Note:
This procedure is only necessary for loading the loadable drivers, not for assigning parameters.
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