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Hello Does anybody have experience with how to go about handling automatic adjustment for day light savings in ML 1400? Can not seem to find anything in documentation or in PLC settings. Thank you for your help

Hello I have three pumps that run on 3 timers one after another non stop. All three pumps share the same current sense which is what I use to determine the status of the pump(run). The logic attached works fine with contractors. Fail over works correctly. As soon as I switch to current sense, when a pump is called and somebody turns a switch to off position, next pump in line should pick it up as a fail over. For some reason when a fail over occurs, instead of switching over to the next pump, it starts flickering, trying to run both pumps. I am positive it has to do with the fact that i am sharing the same current sense (three wires going through it) but can not figure out what is causing this up and and down flickering. Please help! PUMPS.pdf Pumps.RSS

Hello I have a 3 blower logic. Two modes. Mode is changes by pressing a button on a HMI screen, program is on ML 1400. Mode ONE: One blower at a time. 3 blowers total. Each blower goes on and off for a set period of time. Next blower comes second hour, and third blower comes on third hour, fourth hour first blower comes back on again. If running blower fails(contactor), next blower picks up until first(or which ever turn) blower is fixed. Mode TWO: Just like mode one except that two blowers run 2 at a time such as AB - BC- AC. If any of running blowers fail, third spare blower comes on. The problem: In a situation where I am in a single blower mode, if a single running blower fails, instead of another single blower turning on, I have two blowers turning on. As soon as failed blowers(contactor) is fixed, everything goes back to a single blower mode. Somewhere I am crossing fail over logic between single mode and double mode but do not see where. I hope my confusing description makes sense. I also have an oxygen sensor that dictates when blowers turn but please ignore that. Any suggestions would be greatly appreciated! Blowers.pdf

Hello I am still missing something. The issue is that if one of the blowers is in hand/HOA, program should ignore it. So in a single mode or two blower mode, if any of blowers are in hand, they should be ignored. I can not seem to figure out a way to accomplish that. Please help! ML1400 UNTITLED.pdf UNTITLED.RSS

Coil bit B3:21/6 is on HMI. it is a two state button 0 and 1. So the end user chooses in which mode blowers will operate by pressing a button on HMi screen which in turn sets a bit for B3:21/6. The rest of a program has no references to this blower logic.

Hello I have ML1400 with 1762-IQ16 in slot 5. For some reason I only see DI 12-15 when power is applied to those inputs. However anything between 1-11 is always showing as 0 even when power is applied. I have two cards that are doing that. Both Dcoms are connected to a common. Did anybody ever see a problem like this? Thanks for any help

Hello I have PanelView C1000 which has built in editor and produces .cha files. Is there any way to import/convert .cha file into PanelView Plus format?

Hello I have ML1400 with 1762-IF4 expansion card. How do I go about taking an analog input 4-20ma on expansion card and converting that to 0 - 10 V analog output on the PLC itself. PLC only has two AIs and they can not do 4-20ma only voltage. I presume there is some kind of conversion possible 4-20ma to 0 -10V? Thank you for your help

Mickey, I have attached working version PDF and non working version. the only difference is that I used float instead of straight Input. Unless I am missing something? working.pdf

Looks like MicroLogix can not handle on the fly AI 4-20ma to AO 0-10v SCP scaling. It did work AI into Float, SCP AI float range AO range Analog output Thank you for your help

Mickey, I get an Error: Operand sizes do not match

I was trying to take scaled value from 4-20ma analog card input, divide that by 163.83 which I think is 1% of 0-16383 range and multiple that by .1 which is 1% of 0-10V range. Assign that value to AI output 0 on the plc itself. Example attached but it does not assign anything to output Please see rung 5,6 and 7 Thanks AI Output.pdf

Hello I am wondering if somebody had experience with setting up AB Micrologix PLC such as 1400 or similar to respond on different port such as 192.168.1.1:81? Not sure if it is even possible? Thanks for any help

Thanks for the info The idea was to set up a dsl line for remote site. Reason for not using dial up is a very poor line connection(static). It takes 5 min to update the program. During that time I loose connection 95% time. DSL would allow for quick update even if connection is not that great. So the idea is to get DSl line, install cisco router, connect ML1400 to a router, forward ports. The problem I am experienciung is that cisco does not seem to support raw packets. I can not get to PLC using cisco, but if I connect streight to PC or a dumb switch there is no problem. I have PanelView C1000 and it works fine with Cisco router. I understand it is using Windows CE. Is there a router that supports raw packets? Thank you

Hello Looking for the advice on how to set up dial out alarm in case if PLC failed or program got corrupt. The deal out modem has two digital inputs but they wont be useful if PLC fails. Is there a third party device that might accomplish the task of detecting the failure? Thank you

Re: OkiePC. I will try that. What if I have to modify a program remotely, in this case I will have a false alarm going out without somebody manually unplugging a modem. Thank you

Thank you for the suggestion but do not think it will work. Modem input has to be energized in order to send out an alarm. If PLC out is ON, it will go OFF when PLC fails. Nothing will be dialed out since it calls on energize not on deenergize. Unless I missing something?

Hello I have ML 1400 with Signet 2551 flow meter. I am totalizing flow every day, however there is significant discrepancy about 2 thousand gallons a day PLC is under. Meter is set up correctly: K factor and range 0 -70 GPM. On PLC side: Say FE103(Flow Meter) I have scaled for PID 60 Hz and 450 ms. It never shows as zero always 6 or 7. Is not it suppose to be zero when there is no flow? Not sure where the problem in my code or PLC scan time or the way I am going about scaling? Any pointers would be appreciated Totals.pdf

Hello Mickey and Paulengr thank for the tips. I honestly believe that the problem is in the code. Any suggestion where I am be going wrong? There will be some discrepancy but I am off more then 10% which leads me to believe there is an issue with how I go about adding flow to a total. Maybe there is more efficient way

Hello Thank you for the tip. Would it be possible to see an example of low flow cut-off? Thank you

Hello At 0 GPM I get 4.006 mA from signet 8900 panel. It is never true 0 when there is no flow. For PID at 0 gpm and 4 mA it shows 6 or 7 What are you reading at the input card? Same 4.006mA Not sure about this: What raw value are you seeing for the input card? (Hint: this needs to be your raw input value and your scaled input value should therefore be zero). Could you clarify. I honestly believe that the problem is in the code. Any suggestion where I am be going wrong?

Thank you OkiePC for your help. I tried having a range of PID of 0 raw at 4mA to 16383 at 20mA. When there is no flow it shows 6 or 7 raw instead of 0. It is relatively small number considering the range of 0 to 16383. However I am still off (under) by 10 gallons a minute which leads me to believe that the problem is in my code otherwise I do not see where such discrepancy is coming from.

To answer OkiePC's questions: I have to use 1762-IF4 Ser A Rev B 4ch analog card, due to flow meters talking 4-20ma. ML 1400 does have on board AIs but they all digital. All Signets send me 4-20 mA. We checked for noise on the line and it is within spec. I guess the reason these particular meters are used is because of the environment, sewer plant. Does anybody have a suggestion for a better meter for this environment?

Re OkiePC Thank you for pointers To answer your questions: I am off by 2-3k gallons every day. Average day is about 25k gallons, so it is significant. F8:19 comes from another subroutine but it is also a flow meter scaled in a similar manner but different model, so called blind signet. I was given spec of SCH 80 PVC pipe 2". According to manual K factor is 206.69 which is used on signet panel itself for present flow and total flow. I am reading of signet panel into PLC. For 20 mA GPM manual shows 145.15. Sensitivity is 0. Even if I set SCP as: -819 to 16383, scale 0 - 145.15 gpm on PLC I am still under. Thank you

Hello Based on K factor the flow is between 0-145.15 GPM When I talked to Manufacture Support they said that that recommend reducing the range. So meter itself has K factor set plus the range 0-70 GPM instead of 0-145.15GPM On PLC side I am doing the same 0-70GPM and range 0-16383, I also tried -819 to 16383. I always come out lower then Signets panel says