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VACON® 1000 Fieldbus Options
Operating Guide
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Default value is Disable.
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When Enable Auto Demotion and a command is a fast scan command without correct response for N times, then the com-
mand demotes a slow scan command.
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This parameter is valid for Modbus Reading command and cycle Writing command.
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Auto Demotion:
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If a fast-scan command gets an incorrect response for N times, this command is demoted to a slow-scan command.
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The range of the parameter value is 1–255.
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The default value is 3.
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Auto Demotion Time:
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The amount of time a demoted command stays in slow-scan state.
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Automatically returns to the state at the end of the time.
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If it receives the correct response when demoted, it immediately returns to the fast-scan state.
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The range is 100–3600000 ms.
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The default value is 10000 ms.
7.5.2.2 Node Configuration
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Slave address:
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Valid when the subnet protocol mode is set to "Modbus Master".
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The range is 0–247.
7.5.2.3 Command Configuration
Supported Command numbers: 01, 02, 03, 04, 05, 06, 15, and 16.
Command configuration parameters:
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Modbus Register Starting Address:
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Modbus salve register or coils starting address.
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The range of the parameter value is 0–65535.
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Numbers of Data:
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Modbus function code 3, 4, 16: 1–127
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Modbus function code 1, 2, 15: 1–2000
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Memory Mapped Starting Address (HEX):
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The address range of data mapping in the module memory.
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Read command (1, 2, 3, 4): 0x0000–0x03FF
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Write command (5, 6, 15, 16): 0x4000–0x43FF
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This area can also be uses when write command is used as local data exchange: 0x0000–0x03FF.
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Memory Mapped Bit Offset:
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For the bit operation command, the position where the start bit is located.
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The range is 0–7.
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Byte Swap:
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There are 4 modes of Byte Swap: No swap, Double-byte swap, Four-byte swap, Four-Byte Big-endian and Little-endian
Swap.
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Double-byte swap: The high and low bytes of 2 bytes (one register) are exchanged, for example, 0x1234–0x3412.
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Four-byte swap: The first 2 bytes are exchanged with the last 2 bytes, for example, 0x12345678–0x56781234.
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Four-byte Big-endian and Little-endian Swap: For example, 0x12345678–0x78563412.
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Scan Mode:
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Every Modbus command can be set to fast scan or slow scan.
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The gateway sends Modbus command according to the "Scan Rate".
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Scan Rate is the ratio of fast scan to slow scan (configured in the subnet configuration interface).
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