P0924JH端子模块,P0924JH使用配置教程
读取和写入数据表的Modbus命令需要一个参考（起点），并且有些情况下，分数是多少。提供的Modbus命令参考和PLC数据表
PLC中RTU模块访问的元件不一定等于以下所述。
最初，Modbus协议仅用于访问4个不同的数据表，并且写入数据量有限数据RTU模块通过执行参考映射来扩展这些限制。RTU模块包含PLC数据表的地图，并为每个数据分配一系列相关的Modbus参考桌子因此，用户只需简单地通过一个Modbus命令即可访问多个PLC数据表
P0924JH端子模块更改参考。上表描述了Modbus参考的细分区域访问适当的数据表。每个型号的PLC CPU包含每个数据表的不同最大点数。在期间在RTU模块初始化时，询问CPU的每个数据表的大小。应该aModbus参考，并在该命令后立即拨打号码其中n=数字0到9，符号#和*，可能包括下面列出的拨号修饰符。调制解调器将以拨号修改器确定的方式拨打指定的号码。表盘
除；修饰符，必须出现在字符串的末尾。在本例中，调制解调器脉冲拨打9位数字，等待拨号音，然后拨号音拨打数字然后拨打123-4567。最后，调制解调器在结束后返回到命令模式已拨打数字。P修饰符使调制解调器以每秒10个脉冲的固定速率进行脉冲或旋转拨号。T修饰符使调制解调器使用DTMF（双音多频）信号拨号（与“，”修饰符使调制解调器暂停。例如，拨打长途服务时调制解调器必须首先拨打本地接入号码，然后暂停足够长的时间，以接收服务拨号音。“，”在从PBX系统拨号时也很有用，因为两次请求之间可能会花费相当长的时间
并获得第二拨号音或“外部”线路。
@modifier使调制解调器等待一个或多个响铃3秒，然后等待5秒
在处理拨号字符串中的下一个符号之前静音。这在访问以下系统时非常有用：
不要提供拨号音。
The Modbus commands which read and write to data tables require a reference (starting point) and, in
some cases, the number of points. The Modbus command reference provided and the PLC data table
element accessed by the RTU module in the PLC are not necessarily equal as described below.
Originally, the Modbus protocol was only meant to access 4 different data tables with limited writing of
data. The RTU module expands these limitations by performing reference mapping. The RTU module
contains a map of PLC data tables and assigns a range of associated Modbus references to each data
table.Therefore, the user can access more than one PLC data table with a single Modbus command by simply
changing the reference. The tables above describe the sub-divided regions of the Modbus reference to
access the appropriate data table.Each model of the PLC CPU contains a different maximum number of points for each data table. During
initialization of the RTU module, the CPU is interrogated for the size of each of its data tables. Should a
Modbus reference andDial the Number Immediately Following this Command
Where n = digits 0 to 9, the symbols # and *, and may include the dial modifiers listed below.
The modem will dial the number specified in the manner determined by the dial modifiers. The dial
modifiers may appear anywhere within the dial string with the exception of the ; modifier which must
appear at the end of the string.In this example the modem pulse dials a 9-digit number, waits for a dial tone, then tone dials the digits
713. It then dials the number 123-4567. Finally, the modem returns to the command mode after the final
digit has been dialed.
The P modifier causes the modem to pulse or rotary dial at a fixed rate of 10 pulses per second.
The T modifier causes the modem to dial using DTMF (Dual-tone multifrequency) signals (the same as
those used by “touch-tone” telephones)The "," modifier causes the modem to pause. When dialing a long distance service, for example, the
modem must first dial the local access number, then pause long enough for the services dial tone. The ","
is also useful when dialing from a PBX system where considerable time may elapse between requesting
and getting a secondary dial tone or "outside" line.
The @ modifier causes the modem to wait for 3 seconds for one or more rings followed by 5 seconds of
silence before processing the next symbol in the dial string. This is useful when accessing systems that
do not provide a dial tone.
