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79
SCU200
INSITE ENERGY MANAGEMENT SYSTEM
• Error Codes
Modbus protocol defines a common way of error reporting. Every request (read or write) sent in unicast
mode is expected to return a value in packet of the same structure. In case of a message delivery error
(not a CRC problem but a message execution problem), the generated response contains a function code
with MSB (80h) set and a single byte representing the error code, called “exception code”.
The following default exception codes are available:
Code
Name
Description
01h
Illegal function
Function is not supported
02h
Illegal data address Register address is out of control unit’s range, or trying to
write into a read only register
03h
Illegal data value
Value is out of range
04h
Slave device failure
Unrecoverable error occurred while the control unit was
attempting to perform the requested action, for example,
time-out
06h
Slave device busy
Control unit is currently in User Interface Configuration
Mode. Unable to execute the requested action
• Data and Control Registers
A register is always a two-byte (16-bit) value, which can be interpreted as either signed or unsigned values
or which has a special format.
In case of data represented in more than one register the concatenated registers will contain information
with MSB in the lowest address and LSB in the highest address within concatenated addresses.
Do not use registers other than those specified.
Format of one-word register for current values
unsigned = 16-bit unsigned integer notation, resolution 0.01 A
signed = 6-bit signed integer notation, resolution 0.01 A
0000h…7FEFh = 0.00 … 327.51 A
8000h…FFFFh = -327.66 … -0.01 A
7.1.1.CMS current sensor readings
• Values with special meanings
Special values (hex)
Special values (dec)
Meaning
7FF0
32'752
Data pending, acquisition in progress
7FF1 … 7FFB
32'753 … 32'763
Reserved
7FFC
32'764
The sensor is known but not accessible at the
moment
7FFD
32'765
Data type TrueRMS / AC / DC is disabled
7FFE
32'766
Overload (beyond full range)
7FFF
32'767
Forbidden (no sensor with ID xx)
Format of double-word register for branch power and energy values
unsigned = 32-bit unsigned integer notation,
signed = 32-bit signed integer notation
Содержание SCU200
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