Rice Lake 920i Programmable HMI Indicator/Controller - Profibus DP Interface - Manual (Page 10)

6 520/720i/820i/920i Profibus DP Installation and Programming Manual
Parameter value
To allow communication with a multi-scale indicator,
the scale number is sent in the second word of the
output command format. Zero (0) represents the
current scale. Certain commands require a parameter
other than a scale number, such as a slot number,
setpoint number, or other selection parameter. See the
command descriptions in Section 3.3 on page 7 for
specific command requirements.
Value
The third and fourth words of the output format are
used to pass value data on certain commands. Values
entered in these words are treated as unsigned long
integers or floating-point values, depending on the
command.
3.2 Input Command Format
In response to a command, the Profibus Interface
returns data and status information to the master as
four 16-bit words. This information is returned in the
input command format shown in Table 3-3.
The value type can be set for those commands that do
not specify integer or floating point data by sending a
command 0x000 to specify integer data or command
0x100 for floating-point data. The value type is
returned in the status word (bit 14) of the input format.
Command number
The first word echoes the command number. If the
command fails or is not recognized, the negative of
the command number is returned to signal the error.
Status Data
Indicator status data is returned in the second word
(see Table 3-4). Batch commands return batch status
in place of the low byte (see Table 3-5). Setpoint
commands return batch status in the low byte of the
status word and the setpoint number in the high byte.
294 0x126 Read Accumulator (float)
295 0x127 Read Rate of Change (float)
296 0x128 Read Peak (float)
304 0x130 Set Setpoint Value (float)
305 0x131 Set Setpoint Hysteresis (float)
306 0x132 Set Setpoint Bandwidth (float)
307 0x133 Set Setpoint Preact (float)
320 0x140 Read Setpoint Value (float)
321 0x141 Read Setpoint Hysteresis (float)
322 0x142 Read Setpoint Bandwidth (float)
323 0x143 Read Setpoint Preact (float)
368 0x170 Set Register
402 0x192 Get Register
Word Description
Word 1 Command number
Word 2 Status
Word 3 Value (MSW)
Word 4 Value (LSW)
Table 3-3. Input Command Format
Decimal Hex Command
Table 3-2. 520/720i/820i/920if Remote Commands
Word 2
Bit
Indicator Status Data
Value=0 Value=1
00 Error No error
01 Tare not entered Tare entered
02 Not zero Center of zero
03 Weight invalid Weight OK
04 Standstill In motion
05 Primary units Other units
06 Tare not acquired Tare acquired
07 Gross weight Net weight
08 Channel number
(NOTE: Value 0 represents scale #32)
09
10
11
12
13 Not used
14 Integer data Floating point data
15 Positive weight Negative weight
Table 3-4. Indicator Status Data Format
Word 2
Bit
Batch Function Status Data
Value=0 Value=1
00 Digital input 4 OFF
( 520 ) Error
Digital input 4 ON
( 520 ) No error
01 Digital input 3 OFF Digital input 3 ON
02 Digital input 2 OFF Digital input 2 ON
03 Digital input 1 OFF Digital input 1 ON
04 Batch not paused Batch paused
05 Batch not running Batch running
06 Batch not stopped Batch stopped
07 Alarm OFF Alarm ON
Table 3-5. Batch Function Status Data Format