569 Publication 1763-RM001C-EN-P - October 2009
Appendix
F
How to Use 40kHz PTO/PWM of MicroLogix 1100
Series B Controller
The PTO and PWM function files of MicroLogix 1100 Series B controller
are changed to support 40kHz PTO (Pulse Train Output) and PWM (Pulse
Width Modulation). In addition, a newer version of RSLogix 500 is
released to support the changes. To guarantee seamless operation of
MicroLogix 1100 Series B controller, special cares are required in handling
some of PTO and PWM function file elements in user programs. In this
section, detailed information regarding changes in PTO and PWM
function files of MicroLogix 1100 Series B controller and how to handle
PTO and PWM function file elements are described.
Basic requirements to
use 40KHz PTO and
PWM in MicroLogix
Controller
MicroLogix 1100 Series A controller does not support 40kHz PTO and
PWM. Only MicroLogix 1100 Series B controller supports 40kHz PTO and
PWM with any version of RSLogix500.
PTO and PWM function
file changes in Series B
Controller
In a prior version of RSLogix500 (version 7.10 or lower), the frequency
elements (PTO.OF, PTO.OFS, PTO.JF, PWM.OF, pWM.OFS) of PTO and
PWM function files are treated as signed 16-bit (-32768 ~ 32767) and
MicroLogix 1100 Series A firmware didn’t support values above 20000
(20kHz). However, these values are changed to unsigned 16-bit and
40000 (40kHz) respectively to implement 40kHz PTO and PWM functions
in Series B controller.
IMPORTANT
When a user uses a prior version of RSLogix 500
(version 7.10 or lower) with MicroLogix 1100 Series
B controller, maximum operating frequency of PTO
and PWM is still 32767Hz. In order to use 40kHz
PTO and PWM with a prior version of RSLogix 500,
variable type change process is required (unsigned
integer to signed integer).
efesotomasyon.com - Allen Bradley,Rockwell,plc,servo,drive
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