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3.1
INPUT IMAGE TABLE BITS
A table is provided to explain the Input Image
Table presented in Figure 2-4. Table 3-1
defines the bit structure of both input words.
Word 1
BITS 0 - 15
Signed integer.
Word 2
BITS 0 - 5 ABSOLUTE OVERFLOW DATA x 32768
Word 2 bits 0-5 is absolute overflow data from word 1 used if absolute weigh data is greater than 32,767. These 5 bits are
combined with the word 1 integer in a floating point register by the following steps.
1.
Do a Masked move of Word 2 bits 0- 5 to an integer register.
2.
Multiply the integer register by 32768.0 and put the result in a floating point register.
3.
Negate the floating point result if the word 1 integer is negative.
4.
Add the word 1 integer to the floating point result.
BIT 6
FAULT
Is set if there is a fault causing weigh data to be incorrect. This bit is cleared or suppressed by setting the clear fault bit in word 2 of
the output image table.
BIT 7
SCAN ACKNOWLEDGE
This bit is a copy of the same bit in the output Image table. When the D440 receives the output image table data it copies this bit to
the same location in the input image table. The plc can thus know if the remote I/O DXp40 has received the last write to the output
image table.
BIT 8
G/N, GROSS/NET DATA ID.
If this bit = 0 the weigh data in word 1 and bits 0-5 of word 2 is gross data. If this bit = 1 the weigh data is net weigh data.
BIT 9
MOTION
Is set If the weigh data is in motion as determined by the motion settings.
BIT 10 UNABLE TO TARE OR ZERO
Is set if the dxp40 is unable to tare or zero the data after receiving a zero or tare command from bits 1 or 2 of word 2 of the output
image table. The reasons for not being able to zero of tare are found in status #1 register bits 1 8, 2. This status register is
accessible through a block transfer read.
BIT 11
DIAGNOSTIC FAULT
Is set if any of the diagnostic fault bits are satin the status #1 register bits 12 -15 or status #2 register bits 0 -15. These status regis-
ters are accessible through a block transfer read.
BIT 12
SETPOINT #1
Is set if setpoint #1 output is on. If word 2 bit 8 of the output image table = 1 the setpoint #1 output is controlled by the dxp40. ff
word 2 bit 8 of the output image table = 0 the setpoint #1 output is controlled by word 2 bit 12 of the output image table.
BIT 13
SETPOINT # 2
Is set if setpoint #2 output is on. If word 2 bit 9 of the output image table = 1 the setpoint #2 output is controlled by the dxp40. If
word 2 bit 9 of the output image table = 0 the setpoint #2 output is controlled by word 2 bit 13 of the output image table.
BIT 14
SETPOINT #3
Is set if setpoint #3 output Is on. If word 2 bit 10 of the output image table = 1 the setpoint #3 output is controlled by the dxp40. If
word 2 bit 10 of the output image table = 0 the setpoint #3 output Is controlled by word 2 bit 14 of the output image table.
BIT 15
SETPOINT # 4
Is set if setpolnt #4 output is on. If word 2 bit 11 of the output image table = 1 the setpoint #4 output is controlled by the cbq340. If
word 2 bit 11 of the output image table = 0 the setpoint #4 output is controlled by word 2 bit 15 of the output image table.
SECTION 3.
Definitions and Explanations
Table 3-1. Input Image Table Word 'Bit' Definitions
WEIGH DATA (signed integer, -32768 to + 32767)
3-1
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