產(chǎn)品標題: IS200TRLYH1D 數(shù)字量擴展模塊

型號： IS200TRLYH1D

品牌： GE

                                                                              產(chǎn)品詳情資料：

IC695CMM002/004是GE公司提供的串行通信模塊，它提供Serial I/O, 

Modbus Master/Slave, CCM Slave, DNP3 Master/Slave, SPL共五種協(xié)議。

每個通信端口支持64個通信任務(wù)；

每個通信端口有224個模塊及通信狀態(tài)位，可以使用I、M、T區(qū)；

每個通信端口有128個模塊及通信控制位，可以使用Q、M、T區(qū)；

每個通信任務(wù)可以有連續(xù)讀、位控連續(xù)讀、位控單次讀；連續(xù)寫、位控連

續(xù)寫、位控單次寫；禁止等7種方式。

對于可靠性化好的通信對象，一般采取連續(xù)或位控連續(xù)方式即可。

而對于可靠性不太化稍差一些的通信對象，采用位控單次方式比較合理。

舉個例子，有一個溫控儀表，采用連續(xù)讀方式時，由于讀寫周期太短，致使儀表

發(fā)生通信堵塞。采用大周期位控單次讀方式，堵塞情況消失。

控制位的控制方式可以有下述幾種：

1、一個任務(wù)完成后計時，時間到，啟動下一個通信任務(wù)。這里的時間原則上是不同的。這種方法為靈活，但是就是程序量大。

2、同一計時，在不同的時間設(shè)置不同的通信任務(wù)控制位=1。這種方式的優(yōu)點是邏輯簡單，缺點是遇到超時可能會丟失任務(wù)，而且程序量也不小。

3、位定時左(右)移動，程序量小，簡單。缺點是遇到超時可能會丟失任務(wù)。實際上在任務(wù)比較多（>30）時，連續(xù)方式和上述第一種方法也差不太多。這是個賬算事。

發(fā)送接收報文一般按字節(jié)計算，每字節(jié)加起始位、停止位，一般是10位，

停止位是兩位時每字節(jié)是11位，再加一個校驗位，大12位。

標準Modbus讀數(shù)據(jù)發(fā)送報文長度是8字節(jié)，應(yīng)答報文的長度隨讀入數(shù)據(jù)的

多少變化。一般規(guī)律是5+N，那么，發(fā)送接收總字節(jié)數(shù)就是13+N，小值=14。

小位數(shù)=14×10=140位，或=14×12=168位。

                         產(chǎn)品英文詳情料:

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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