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  1. Hello! I am new at programing PLCs. I am using TM241CE24R PLC with TM3AI4 analog input module. I can successfully read temperature from 4-20 mA sensor. I want to communicate with my PC (SCADA) via Modbus TCP. For testing purposes I am using CAS Modbus Scanner. I can read digital inputs, coils and holding registers successfully. Problem is that I can't read analog inputs (#300001 etc.).  I have nothing defined in GVL list. Is this causing problem? I also don't have any Modbus TCP Slave device in Ethernet_1. But how can be all the other registers read successfully?  Please take a look at screenshots below. Also check Error message from CAS Modbus Scanner. Where is problem? Please help. Thanks in advance!
  2. Program 16 position rotary selector switch

    I have a 16 position rotary selector switch I'm trying to program to a CQM1 PLC, that I will also be programming to a micrologix 1200 in the future, using CX Programmer. The switch connects to the PLC using 4 inputs, and activates the inputs in a binary pattern 0-16 as I turn the switch. For example: if the switch is wired to the first four inputs of the PLC, and is turned to "9" 0.0 and 0.3 will be activated and 0.1 and 0.2 will not, just like binary 9 = 1001. I have tried several things trying to get the PLC to accept these inputs as a single "data-point," and then convert to BCD or Hex to use in a timer. I'm having no luck! Does anyone have any ideas how this is done? The switch is a Tosoku DPP01 015L20RCB, and because of the age of the PLC my instruction set is limited. Thank you in advance!
  3. I just commissioned a system utilizing 3 1756-IRT8I TC Analog Input Modules. It was soon discovered that there were sags in the order to 2 -10 % in the inputs across all channels. These sags occurred in all three modules but at different times but were occurring more or less on ~4-6 hour intervals. There are two CJC inputs (Cold Junction Compensation) and it was discovered that one CJC value also sagged while the other one remained constant through the sags. Tech Support had no information about the issue, but eventually found that there was a thus far unannounced firmware update, that was made available. The problem modules all had FW Version 1.013 and the Update Version as of Mid Oct, 2015 is Version 1.014. Following the FW update, the sags are no longer being seen. Bob A.
  4. Use to working on DC inputs, now I have a PLC I am playing with and the digital inputs are AC, can I still just wire a on/off switch to complete the circuit just for testing? This is a micrologix 1100.
  5. Hi everybody, I am new in these issues and I have faced a problem that is driving me nut. I am building a mixing batch HMI and its PLC program. In my HMI I created an analog tag that stores and integer number. This tag is responsible to comunicate with an analog input of the PLC I/O expansion module, whose address is I:1.0. In my HMI I put a numerical input box to send values to this analog input, but every time I write a value in this box and press the enter key the numerical input box gets red and don't send the value to the plc. Appear the following error message "cause: Addressing problem or memory protect rungs" on the left botton corner of the HMI. Some pictures are annexed to describe better. Anybody knows what can I do? I am using PLC SLC 5/03 + Analog module 1746-NI4