GE PLC digital input module IC697MDL740
Brand ABB color standard application Industrial height 380mm rated current 516mA
Protection Level IP45 Suitable for the motor power 128KW Application Site Power Industry BOM Number GJR2391500R1220 Power industry HIEE401782R0001 Part Number IC697MDL740
Applicable pipe 2 Whether imported is weighing 5.69 kg can be sold nationwide
GE PLC digital input module IC697MDL740
For highly reliable and standardized communication objects, the continuous or bit-controlled continuous mode can be generally adopted.
For the communication objects with low reliability and poor standardization, it is reasonable to adopt the single bit control method.
For example, there is a temperature control instrument, using continuous reading mode, because the read and write cycle is too short, resulting in the instrument
A communication jam occurred. Using the large-cycle bit-controlled single read mode, the blockage disappears.
Control bits can be controlled in the following ways:
1, after a task is completed, time is up, start the next communication task. Time here is different in principle. This method is the most flexible, but it is a lot of procedures.
2. At the same time, set different communication task control bits =1 at different times. The advantage of this method is that the logic is simple, the disadvantage is that the task may be lost when encountering a timeout, and the amount of programs is not small.
3, bit timing left (right) movement, small program amount, simple. The disadvantage is that you may lose tasks when encountering timeouts. In fact, when there are more tasks (>30), the continuous method is not much different from the first method above. It’s a matter of accounting.
The sent and received packets are generally counted in bytes. Each byte contains a start bit and a stop bit (usually 10 bits).
If the stop bit is two bits, each byte is 11 bits, plus a check bit, a maximum of 12 bits.
The length of the standard Modbus read data sending message is 8 bytes, and the length of the reply message depends on the length of the read data
How much change. The general rule is 5+N, then the total number of bytes sent and received is 13+N, the minimum value =14.
Minimum number of digits =14×10=140 digits, or =14×12=168 digits.
GE PLC digital input module IC697MDL740
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