© Brüel & Kjaer Vibro ● S1079330.002 / V04 ● █ Page 135 of 188
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Brüel & Kjaer Vibro │ Instruction
VC-8000 MPS
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EN
21.3.2 Scaled Value
Scaled Value sets the full-scale data range for Modbus data.
Scaled Value Bits Application
4095
Compatibility with BN 3300 (i.e. 0-4095 is 0-10 mils)
16-bit DCS systems (i.e. 0-65535 is 0-10 mils)
21.3.3 Modbus Map (Standard or Custom)
This value indicates whether the SAM is using the standard (or default) Modbus map, or a custom
Modbus map.
Custom Modbus maps use the Modbus address in the excel file; The Modbus address shown
in SAM properties is ignored.
21.3.4 Communications Fault - Time Delay
If the SAM does not receive a valid Modbus command within the configured time, the SAM will
indicate a Modbus error and log a failure event in the System Event list. Communications Fault Time
Delay applies to both Ethernet and Serial Modbus connections.
21.3.5 Word Order
Controls the word order of the Modbus data (a word is 16 bits).
Not-Swapped: The lower (least significant) word is placed in the lower register.
Swapped: The higher (most significant) word is placed in the lower register
21.3.6 Allow Invalid Address
Use with caution. When Allow Invalid Address is checked, requests for a register with an undefined
address will not generate a Modbus error; Undefined registers will return a value of zero. When not
enabled, the SAM follows the Modbus standard and returns an error response when a command
addresses an undefined register.
This setting can be useful in a rack replacement scenario – where the end user does not want to
modify the DCS Modbus program. The DCS can request registers that are not in the VC-8000, and
the rack will simply return a value of zero for those registers.
21.3.7 Allow Status Register Writes
Enables Modbus write commands. When disabled, the SAM will return an exception when a write
register command is attempted.
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