jerpvtx

Thanks, I'll give it a shot.

I have a 1756-L71 with a 1756-HSC/B which I am using to trigger an event in my PLC and I am having issues capturing all my events. I have a 500 PPR encoder wired into inputs A and B. The encoder has a 6.25" wheel attached. The wheel will contact a moving piece of material 20' long traveling at 300 FPM (60 In/Sec). What I want is to trigger a PLC routine to run every 4" (this number is variable but for the sake of this topic I chose 4") of travel. What I have tried 1. I used the presentValue DINT in a GEQ to latch my event trigger. Then I used the event trigger to reset my HSC 2. I calculated the equivalent number of pulses (101.86 - see below) to set the ON value of an output in the HSC and siimilar counter reset logic to #1 3. Same as 1# (GEQ) except I used the value calculated in #2 as the rollover value for the HSC The RPI was initially default but I lowered it to 2mSec. To test my logic I would slowly turn the wheel 10 full revolutions and use my event trigger to increment a counter. What I expected to see is 49 counts (see below) what I would get was something different, usually lower like 46. I paralleled channel 0 wiring to channel 1 but I never reset channel 1. I then used channel 1 to verify that I am getting the expected number of counts (500 PPR * 10 rev = 5000 pulses) and I did. I am confident the HSC is counting properly, I believe I am doing something inherently wrong in my code. This seems like a pretty straight forward application, does anyone have a sample that I can test or suggestions? I am testing at low speed I am afraid to see how bad it will be at 300 Ft/Min! MATH: encoder = 500 Pulse/Rev, wheel = 19.635 In/rev, max line speed 60 In/Sec, event triger at 4 In/Trig 500 P/Rev | 19.635 In/Rev = 25.465 Pul/In @ max speed 60 In/Sec * 25.465 Pul/In = 1527.9 Pul/Sec => 0.654 mSec/Pulse Event Trigger: 4 In/Trig * 25.465 Pul/In = 101.86 Pul/Trig 500 Pul/Rev | 101.86 Pul/Trig = 4.9087 Trig/Rev => 4.9087 Trig/Rev * 10 Rev = 49 Triggers

I have a Quantum PLC and a 140 NOE 771 00 which has been sitting on my shelf for several years. I need to use it but do not know the IP address of the NOE module. I tried the bootP utility and got no response. How do I determine the address or reset it to factory default?