WECON PLC Module LX2N-4AD
1 / 9Pages

Wecon Technology Co.Ltd., SITE: http://en.we-con.com.cn Techinical Support: liux@we-con.com.cn Skype: fcwkkj PHONE: 86-591-87868869

The LX2N-4AD special module has four input channels.The input channels receive analog signals and convert them into a digital value.This is called an A/D conversion, the maximum resolution is 12 bits. The selection of voltage or current based input/output is by user wiring.Analog ranges of -10 to 10V DC Data transfer between the LX2N-4AD and the LX2N main unit is by buffer memory exchange. There are 32 buffer memories (each of 16 bits) in the LX2N-4AD. LX2N-4AD consume 5V voltage from LX2N main unit or active extension unit,90mA current of power © Extension cable and connector © Com...

The analog input is received through a twisted pair shielded cable. This cable should be wired separately from power lines or any other lines which may induce electrical noise. If a voltage ripple occurs during input, or there is electrically induced noise on the external wiring, connect a smoothing capacitor of 0.1 to 0.47uF, If you are using current input, connect the V+ and l+ terminals to each other. If there is excessive electrical noise, connect the FG frame ground terminal with the grounded Connect the ground terminal on the LX2N-4AD unit with the grounded terminal on the main unit....

Analog Inputs continued. Current input Current input Preset ranges are selected by an appropriate setting in buffer memory of the analog block. Current/Voltage input selection must match the correct input terminal connections.

b7 b6 b5 b4 b3 b2 b1 b0 Reserved Reset to Defaults and Preset. Default = 0 Offset, Gain Adjust Prohibit. Default = (0, 1) Permit Offset, Gain Adjust G4 O4 G3 O3 G2 O2 G1 O1 Offset Value Default = 0 Gain Value Default = 5,000 Reserved Error status Identification code K2010 Cannot be used In buffer memory locations (BFMs)marked with an “*” data can be written from the PC using the TO command. For buffer memories (BFMs) without “*”mark, data can be read to the PC using the FROM command. Before reading from the analog special function block, ensure these settings have been sent to the analog...

offset adjustments. (b) If (b1, b0) of BFM #21 is set to (1,0), gain and offset adjustments are prohibited to prevent inadvertent changes by the operator. In order to adjust the gain and offset values, bits (b1, b0) must be set to (0,1). The default is(0,1). (c) Gain and offset values of BFM #23 and #24 are sent to non-volatile memory gain and offset registers of the specified input channels. Input channels to be adjusted are specified by the appropriate G-O (gain-offset) bits of BFM #22. Example:If bits G1 and O1 are set to 1,input channel 1 will be adjusted when BFM #22 is written to by a...

Therefore, a delay timer should be used before writing to the EEPROM a second time. 5. Defining gain and offset Gain determines the angle or slope of the calibration line,identified at a digital value of 1000. (a) Small gain Large steps in digital readings (b) Zero gain default : 5V or 20mA. (c) Large gain Small steps in digital readings. Offset is the ‘Position’ of the calibrated line, identified at a digital value of 0. (d) Negative offset. (e) Zero offset default : 0V or 4mA. (f) Positive offset. Offset and gain can be set independently or together. Reasonable offset ranges are -5 to +5V...

error value is normal The ID code for the special function block at position "0" is read from BFM #30 of that block and stored at D4 in the main unit. This is compared to check the block is a LX2N-4AD, if OK M1 is turned ON. These two program steps are not strictly needed to perform an analog read. They are however a useful check and are recommended as good practice. The analog input channels (CH1, CH2) are setup by The number of averaged samples for CH1 and CH2 is The operational status of the LX2N-4AD is read from BFM #29 and output as bit devices at the LX2N main If there are no errors...

(HOOOO) -> BFM #0 (initialize input channels) Enter the instructions on the left and RUN the PC. BFM #21 (gain/offset adjust prohibit) must be set to permit with Reset adjust bits. Therefore channel 1 is adjusted. BFM #21 gain/offset adjust prohibit. I.Check whether the input wiring and/or extension cables are properly connected on LX2N-4AD analog special function block. II.Check that the LX2N system configuration rules have not been broken, i.e. the number of special function blocks does not exceed 8 and the total system I/O is equal or less than 256 I/O. III.Ensure that the correct...