Block Transfer Commands
21
4.4
Read Accumulator Value
The Read Accumulator Value block write command is used to read accumulator values from the indicator.
Table 4-10 shows the format of the command:
Table 4-10. Block Write Command 4: Read Accumulator Value
Command Number
Specifies the Read Accumulator Value command number, 4.
Accumulator Number
Specifies the number of the accumulator being read. Specify channel 1 for IQ plus 710 indicators.
Block read command 4 returns a 2-word accumulator value to the PLC controller. If the block write command
failed, the command number returned in word 0 is set negative (-4). Table 4-11 shows the format of the block
read command.
Table 4-11. Block Read Command 4: Read Accumulator Value
Word
Bit Number
Word Contents
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
Command Number (4)
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
Accumulator Number (1)
Word
Bit Number
Word Contents
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
Command Number (4)
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
Accumulator Number (1)
2
v31
Accumulator Value
v16
Accumulator Value (MSW)
3
v15
v00
Accumulator Value (LSW)
DISCONTINUED
