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VACON® 1000 Fieldbus Options
Operating Guide
7.5.5 Subnet Configuration - User Config
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Baud Rate: 300, 600, 1200, 2400, 4800, 9600, 19200, 38400, 57600, or 115200 bps
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Data Bits: 7 or 8
•
Parity Check: None, Odd, Even, Mark, or Space
•
Stop Bits: 1 or 2
•
Transmission Mode:
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RTU or ASCII
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Valid when communication mode is poll mode.
•
Response Timeout:
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After the Modbus Master sends a request, it waits the response time of the Modbus slave.
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The range is 300–60000 ms.
•
Delay between Polls:
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Delay between a response has been received and sending next request.
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The range is 0–2500 ms.
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Valid when communication is poll mode.
•
Output Mode:
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Valid when communication is poll mode.
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Write command (command with data in request).
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There are 3 types of output command:
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Cycle: Same as Modbus read command (command without data in request) output way.
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Forbidden: Disable output of Modbus write command.
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Change of Value: When the output data change, the write command is sent, and stops to output when receiving the
right response.
•
Communication Mode:
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There are two kinds of communication modes: Poll Mode and Receiving only Mode.
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Poll Mode is similar to the Modbus communication.
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Receiving only Mode is that the gateway only receives data.
•
Time Interval Between Characters:
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In Receiving only Mode, it is the maximum time interval between characters and used to decide whether a frame is termina-
ted or not.
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The range is 1–300 ms.
•
Check Mode:
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There are 3 check modes: None check, CRC check, and Sum check.
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The check mode is effective in Receiving Only mode of communication.
•
I/O Channel Status Word:
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In Modbus Master and User Config mode (Poll mode of Output mode only), each command has 1 bit data to indicate the
execution status.
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The bit is 1 when the command status is normal, otherwise is 0.
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The length of the status word is 2 bytes.
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In Modbus Slave and Customer Protocol mode, the 2-byte word is used to indicate the number of times the frame has been
correctly received.
7.6 Working Principle
7.6.1 Data Exchange
Mapping establishes the data conversion between PROFINET network and serial of the gateway. The gateway has two data buffers:
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