is200trlyh1d 数字量扩展模块-凯时尊龙官网

产品标题: is200trlyh1d 数字量扩展模块

型号： is200trlyh1d

品牌： ge

                                                                              产品详情资料：

ic695cmm002/004是ge公司提供的串行通信模块，它提供serial i/o, 

modbus master/slave, ccm slave, dnp3 master/slave, spl共五种协议。

每个通信端口支持64个通信任务；

每个通信端口有224个模块及通信状态位，可以使用i、m、t区；

每个通信端口有128个模块及通信控制位，可以使用q、m、t区；

每个通信任务可以有连续读、位控连续读、位控单次读；连续写、位控连

续写、位控单次写；禁止等7种方式。

对于可靠性化好的通信对象，一般采取连续或位控连续方式即可。

而对于可靠性不太化稍差一些的通信对象，采用位控单次方式比较合理。

举个例子，有一个温控仪表，采用连续读方式时，由于读写周期太短，致使仪表

发生通信堵塞。采用大周期位控单次读方式，堵塞情况消失。

控制位的控制方式可以有下述几种：

1、一个任务完成后计时，时间到，启动下一个通信任务。这里的时间原则上是不同的。这种方法为灵活，但是就是程序量大。

2、同一计时，在不同的时间设置不同的通信任务控制位=1。这种方式的优点是逻辑简单，缺点是遇到超时可能会丢失任务，而且程序量也不小。

3、位定时左(右)移动，程序量小，简单。缺点是遇到超时可能会丢失任务。实际上在任务比较多（>30）时，连续方式和上述第一种方法也差不太多。这是个账算事。

发送接收报文一般按字节计算，每字节加起始位、停止位，一般是10位，

停止位是两位时每字节是11位，再加一个校验位，大12位。

标准modbus读数据发送报文长度是8字节，应答报文的长度随读入数据的

多少变化。一般规律是5 n，那么，发送接收总字节数就是13 n，小值=14。

小位数=14×10=140位，或=14×12=168位。

                         产品英文详情料:

ic695cmm002/004 is a serial communication module provided by ge, which provides serial i/o,

there are five protocols: modbus master/slave, ccm slave, dnp3 master/slave, and spl.

each communication port supports 64 communication tasks;

each communication port has 224 modules and communication status bits, which can use i, m, and t zones;

each communication port has 128 modules and communication control bits, which can use q, m, and t zones;

each communication task can have continuous read, position controlled continuous read, and position controlled single read; continuous writing, position controlled concatenation

continuation and single write of position control; prohibit and wait for 7 methods.

for communication objects with high reliability and good standardization, continuous or position controlled continuous methods are generally adopted.

for communication objects with low reliability and slightly lower standardization, it is more reasonable to use a single position control method.

for example, there is a temperature control instrument that uses continuous reading mode, but due to the short reading and writing cycle, the instrument

communication blockage occurred. by using a large cycle position control single read method, the blockage situation disappears.

there are several control methods for the control bit:

1. after a task is completed, time is set to start the next communication task. the time here is different in principle. this method is the most flexible, but it has a large program size.

2. at the same timing, set different communication task control bits at different times=1. the advantage of this approach is its simple logic, while the disadvantage is that encountering a timeout may result in task loss, and the program size is also large.

3. bit timing moves left (right), with small program size and simplicity. the disadvantage is that encountering a timeout may result in task loss. in fact, when there are many tasks (>30), the continuous method is not much different from the first method mentioned above. this is an accounting matter.

sending and receiving messages are generally calculated in bytes, with start and stop bits added to each byte, usually 10 bits,

when the stop bit is two bits, each byte is 11 bits, plus one check bit, up to a maximum of 12 bits.

the length of the standard modbus read data transmission message is 8 bytes, and the length of the response message varies with the read data

how much change. the general rule is 5 n, so the total number of bytes sent and received is 13 n, with a minimum value of 14.

minimum number of digits=14 × 10=140 bits, or=14 × 12=168 digits.

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