Viewing the logic status and feedback – Rockwell Automation 20-COMM-H RS485 HVAC Adapter FRN 2.xxx User Manual
Page 63
Using Siemens Building Technologies P1 FLN
6-7
20-COMM-H RS-485 HVAC Adapter User Manual
Publication 20COMM-UM009D-EN-P
The P1 FLN point map provides points to execute other commands on an
adapter or drive. These points include CTRL ADDRESS (point 01),
CURRENT LIMIT (point 30), ACCEL TIME (point 31), and DECEL
TIME (point 32). Refer to
Table 6.E on page 6-8
for a description of the
various points.
Viewing the Logic Status and Feedback
There are two ways to determine drive status:
•
The more common way uses points such as RUN.STOP MON (point 23)
and FWD.REV MON (point 21) that represent individual bits in the
Logic Status word. Refer to
Table 6.B on page 6-3
for a list of points. For
example, to view if a PowerFlex 70/700 drive is running, you can read
RUN.STOP MON (point 23) to see if it is “RUN” or “STOP.” To view its
direction, you can read FWD.REV MON (point 21) to see if it is “FWD”
or “REV.”
•
The second way uses LOGIC STS LO (point 95) and LOGIC STS HI
(point 96). The LOGIC STS LO and LOGIC STS HI are both 8-bit
points that the adapter can use to report its 16-bit status word. Refer to
, for definitions of the bits in
the status word. Since LOGIC STS LO gets updated only when LOGIC
STS HI is read, you must read LOGIC STS HI prior to reading LOGIC
STS LO to maintain the data integrity of the status word. For example, to
view if a PowerFlex 70/700 drive is running, you can read LOGIC STS
HI and LOGIC STS LO and determine if bit 1 is “0” (Not Running) or
“1” (Running). To view its direction, you can read LOGIC STS LO and
LOGIC STS HI and determine if bit 3 is “0” (Reverse) or “1” (Forward).
90
LOGIC CMD HI bits
6, 5, 4
12, 13, and 14 Reference
Select
Bits
06 05 04
0
0
0
= No Command
0
0
1
= Ref 1 (Ref A Select)
0
1
0
= Ref 2 (Ref B Select)
0
1
1
= Ref 3 (Preset 3)
1
0
0
= Ref 4 (Preset 4)
1
0
1
= Ref 5 (Preset 5)
1
1
0
= Ref 6 (Preset 6)
1
1
1
= Ref 7 (Preset 7)
90
LOGIC CMD HI
bit 7
15
MOP
Decrement
0 = Not Decrement
1 = Decrement
(1)
A 0 = Not Stop condition (Logic Command bit 0) must first be present before a 1 = Start condition will start the
drive.
(2)
To perform this command, the value must change from “0” to “1.”
(3)
Setting CMD RUN.STOP to STOP issues a momentary Stop command to the drive. Logic Command Bit 0 is
momentarily set to 1 (STOP) to initiate a Stop and then set to 0 (Not Stop).
Table 6.D Logic Commands (Continued)
Point
Number(s) Point
Logic
Command Bit
PowerFlex 70/700 Example
Descriptio
n
Values