Rockwell Automation 20-COMM-H RS485 HVAC Adapter FRN 2.xxx - Manual (Page 61)

Using Siemens Building Technologies P1 FLN 6-5
20-COMM-H RS-485 HVAC Adapter User Manual
Publication 20COMM-UM009D-EN-P
Using the P1 FLN Point Map
for I/O On Siemens Building Technologies P1 FLN, data transfers are used to
transfer the I/O data that controls the drive and sets its Reference. Note that
Output I/O is data that the master device sends and the adapter receives.
Input I/O is status data that the adapter sends and the master device receives.
Important: In order for the drive to use the I/O and Reference from the P1
FLN network, you must set parameters in it and the adapter to
receive the I/O and Reference. For details, refer to
Setting the I/O Configuration on page 3-5 .
Setting the Logic Command and Reference
On Siemens Building Technologies P1 FLN, there are two ways to control a
drive and set its Reference.
•
The more common way uses points such as CMD RUN.STOP (point 24)
and RUN ENABLE (point 26). Refer to
Table 6.B on page 6-3 for a list
of points. For example, to start a PowerFlex 70/700 drive, you can set
CMD RUN.STOP (point 24) to “RUN.” To stop it, you can set CMD
RUN.STOP (point 24) to “STOP” or RUN ENABLE (point 26) to
“STOP.”
•
The second way uses LOGIC CMD HI (point 90) and LOGIC CMD LO
(point 89). The LOGIC CMD LO and LOGIC CMD HI points are both
8-bit points. The adapter joins these two words together to make a 16-bit
command word. Refer to
Appendix C , Logic Command/Status Words ,
for definitions of the bits in the command word. The command word in
the adapter’s buffer is updated with the content of LOGIC CMD LO and
LOGIC CMD HI points. It is transferred to the drive when LOGIC CMD
HI is written. Therefore, to maintain data integrity of the command word,
LOGIC CMD LO must be written prior to writing LOGIC CMD HI. For
example, to start a PowerFlex 70/700 drive, you can write a value of “2”
to LOGIC CMD LO and a value of “0” to LOGIC CMD HI. To stop it,
you can write a value of “1” to LOGIC CMD LO and a value of “0” to
LOGIC CMD HI.
The Reference value is a 16-bit value in the drive but will only use 15 bits
due to the P1 FLN protocol limitation. You can send the reference using
REFERENCE (point 92). Remember that the Reference value is a scaled
!
ATTENTION: Select and use either the point type Digital
(LDO) or the word type Analog (LAO) as a control method, but
not both. Conflicts caused from using both methods can result in
dangerous operation. Failure to observe this precaution could
cause bodily injury and/or damage to equipment.
!
ATTENTION: LOGIC CMD LO (point 89) must be written
prior to LOGIC CMD HI (point 90) to maintain data integrity of
the Logic Command word. Failure to observe this precaution
could result in bodily injury and/or damage to equipment.