AMCI NR60E2, Руководство пользователя

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Modbus TCP protocol
M
ODBUS
TCP C
ONFIGURATION
73
Output Data Format (continued)
Command Word
Figure R4.2 Command Word Format
Apply Preset Value:
These four bits control when the Preset Value in registers 1025 and 1026 is applied to
the position value. In order for the position to be preset, the value in these four bits must transition
from 0x2 (0b0010), to 0xD (0b1101). When these four bits make this transition, the NR60E2 calcu-
lates the position offset needed to bring the position to the Preset Value.
1)The minimum time between writes to the NR60E2 is one millisecond. (The
NR60E2 reads the input data every millisecond.) If the 0x2 or 0xD values are
updated faster than 1 millisecond, the NR60E2 may not catch the transitions on
the proper bits.
2)When the Total Measurement Range parameter is changed, the Preset Value is not
reset to zero. Therefore it is possible to have a Preset Value in registers 1025/1026
that is greater than the Total Measurement Range parameter in registers 1031/
1032. If you attempt to apply a Preset Value that is greater than the Total Measure-
ment Range, the NR60E2 will respond with a Modbus Exception Code 3 when it
senses the 0x2 to 0xD transition on the Command Word. It will leave the reported
position value unchanged.
Store Parameter to Flash:
These four bits control when the programmable parameters are stored to non-vol-
atile memory. These values are not automatically written to this memory whenever they are changed.
In order to store these parameter values, these four bits must
transition from 0x2 (0b0010), to 0xD
(0b1101). Note that these bits are in locations 04 - 07. The actual register values when issuing this
command are 0x20 and 0xD0.
Setting the Total Measurement Range parameter to a non-zero value will force the
NR60E2 to automatically store the internal position offset to non-volatile memory. If
the
Total Measurement Range parameter equals zero, the internal position offset is
stored to non-volatile memory along with the programmable parameters when a
Store Parameter to Flash command is issued. Therefore, if the
Total Measurement
Range parameter equals zero and you preset the position, the calculated internal off-
set is reset to the last value stored in non-volatile memory when you cycle power.
Command Word
RESERVED: Bit must equal zero.
15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00