Rockwell Automation 1395 ControlNet Communication Board - Manual (Page 23)

3–9 Configuration & PLC Interfacing
Publication 1395–5.37– March, 1999
Bit numbering in the PLC Controller is performed in Octal, as opposed to
Decimal numbering in the Drive parameter 150, so it is necessary to relate
the output image table bits to the controlled bits in parameter 150. Figure
3.6 shows the correlation between the output image table bits and the
Drive parameter 150 bits. As a result of this relationship, if it is desired
to set the start bit in parameter 150 (bit 12 decimal), then bit 021/14 must
be set as shown in the first rung of Figure 3.5. Control of other logic bits
is illustrated in Figure 3.5.
Figure 3.6. Bit Mapping for Logic Command (P150, 151, 152)
Output Image Table
PLC Controller (Rack 2) ControlNet Scheduled
Data Interface
150
Group 0
Group 1
Group 2
Group 3
Group 4
Group 5
Grpup 6
Group 7
Sinks
Port B
Sources
300
0 : 21
Logic Cmd 1
00
01
02
03
04
05
06
07
10
11
12
13
14
15
16
17
Par 150
00
01
02
03
04
05
06
07
08
09
10
11
12
13
14
15
Run Reference Select A
Run Reference Select B
Run Reference Select C
MOP Increment
MOP Decrement
Ramp Disable
MOP Rate 1
MOP Rate 2
Command Enable
Jog 2
Jog 1
Normal Stop
Start
Close Contactor
Clear Fault
Process Trim Enable
The first 3 bits of the Logic Command word (parameter 150 in this
example), are used to determine which speed reference will be used by
the Drive. If the normal run speed reference input to parameter 154 is to
be used, all three bits must be 0. If a preset speed or the MOP function
will be used, bits 0–2 are set accordingly (refer to Bulletin 1395
Installation and Maintenance manual for a complete description of the
Logic Command bits). In this example, the first three bits of word 2 of
integer file N7 are used to determine the speed reference used by the
Drive as shown on rung 4 in Figure 3.5.
If the normal run speed reference is selected, the PLC Controller must
send a 16 bit word to External Vel Ref (parm 154) in the Drive. Because
the speed reference is a complete 16 bit word, the PLC Controller must
send the data as a complete word rather than as individual bits as was the
case for logic command bits. In this example, word 1 of integer file N10