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HCFA Corporation Limited
1. Introduction
●TX2N-4AD4DA analog special function block has four input channels, four output
channels. The input channels receive analog signals and convert them into a digital value.
This is called an A/D conversion. The output channels take a digital value and output an
equivalent analog signal. This is known as a D/A conversion. TX2N-4AD4DA has a
maximum resolution of 12 bits.
●TX2N-4AD2DA analog special function block has four input channels, two output
channels. There's no CH3, CH4 compared with TX2N-4AD4DA. The function and
performance of CH1, CH2 is same to the ones in TX2N-4AD4DA.
●In AD block, the selection of voltage or current based on input/output is by user wiring.
Analog ranges of -10 to 10V DC (resolution: 5mV), and/or 4 to 20mA, -20 to 20mA
(resolution: 20 µA) may be selected.
●In DA block, the selection of voltage or current based on input/ output is by user wiring.
Analog ranges of -10 to 10V DC (resolution: 5mV), and/ or 0 mA to 20 mA, 4 to 20mA
(resolution: 20 µA) may be selected.
●Data transfer between TX2N-4AD4DA（TX2N-4AD2DA）and main units is completed by
buffer memory exchange. There are altogether 64 buffer memories, 32 in 4AD, 32 in
4DA(each of 16 bits).
●The TX2N-4AD4DA draws 30mA from the 5V rail of the main unit or powered extension
unit.
1.1 External Dimensions
1. 24V power supply terminal
3. A/D conversion indicator lamp
5. 24V Power indicator lamp
TX2N-4AD4DA Special Function Block
TX2N-4AD2DA Special Function Block
User's Guide
2. 0V power supply terminal
4. Bus power indicator lamp (LED)
6. D/A conversion indicator lamp
1
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Summary of Contents for HCFA TX2N-4AD4DA
- Page 1 ●Data transfer between TX2N-4AD4DA（TX2N-4AD2DA）and main units is completed by buffer memory exchange. There are altogether 64 buffer memories, 32 in 4AD, 32 in 4DA(each of 16 bits). ●The TX2N-4AD4DA draws 30mA from the 5V rail of the main unit or powered extension unit. 1.1 External Dimensions 1.
- Page 2 At most 8 special function blocks can be connected to a MPU from No.0 to No.7 in sequence. As TX2N-4AD4DA is the equivalent of 4AD, 4DA special function units(TX2N-4AD2DA is the equivalent of 4AD, 2DA special function units), if you want to connect these two special function units with others at the same time, TX2N-4AD4DA（TX2N-4AD2DA）must be connected at last.
- Page 3 5. Shorting voltage output terminal or connecting current output load to voltage output terminal may damage the TX2N-4AD4DA（TX2N-4AD2DA）in D/A conversion. 6. Connect the ground terminal on the TX2N-4AD4DA （TX2N-4AD2DA）unit with the grounded terminal on the main unit. Use 3-level grounding on the main unit, if available.
- Page 4 ±1%（for the range of -10V to +10V ） ±1% （for the range of -20mA to +20mA ） Overall accuracy TX2N-4AD4DA，DA has 4 channels（TX2N-4AD2DA ，DA has 2 channels） Conversion speed 2.1ms for each channel(Change in the number of channels used will not change the conversion speed) Photo-coupler isolation between analog and digital circuits.
- Page 5 HCFA Corporation Limited Channel 4 Channel 1 These buffer memories contain the present value currently being read by each input channel. Channel 2 Channel 3 Channel 4 #13-#14 Reserved Selection of A/D conversion speed When set to 0, a normal speed is selected of 15ms/channel When set to 1, a high speed is selected of 6ms/channel ●In buffer memory locations (BFMs) marked with an “*”, data can be written from the PLC...
- Page 6 HCFA Corporation Limited By writing 0 or 1 to BFM #15 of the AD Block, the speed at which A/D conversion is performed can be changed. 3) Adjusting Gain and Offset values a) When buffer memory BFM #20 is activated by setting it to K1, all settings within the analog special function block are reset to their default settings.
- Page 7 HCFA Corporation Limited Switching the output mode resets the I/O characteristics to the factory-default characteristics. 2)Example: H2110 [BFM #1, #2, #3 and #4]: Output data channels CH1,CH2,CH3 and CH4 BFM #1: Output data of CH1(Initial value:0) BFM #2: Output data of CH2(Initial value:0)
- Page 8 ●Values of BFM #0, #5, and #21, (marked E) are stored in the EEPROM memory of the TX2N-4AD4DA. BFM #10 to #17 are copied to EEPROM when the gain/offset setting command BFM #8, #9 is used. Also, BFM #20 causes the resetting of the EEPROM memory.
- Page 9 HCFA Corporation Limited Gain determines the angle or slope of Offset is the ‘position’ of calibration line, calibration line, identified at a digital identified at a digital value of 0. value of 1000. a)Small gain value: Large steps in d)Negative offset...
- Page 10 6.2 AD Basic program In the following example, CH1 and CH2 are used as voltage input. The TX2N-4AD4DA AD block is connected at the position of special function block NO.1. The number of averaged samples is set at 4 and data registers D0 and D1 of the main unit receive the averaged digital data.
- Page 11 HCFA Corporation Limited Adjustment starts. (H000)→BFM #0 (input channels selection) Input instruction as shown in the left and PC run. (K1)→BFM #21 BFM #21 (gain/offset prohibition) must be set to permission with (b1, b0) = (0,1) (K0)→BFM #22 (Offset/gain adjustment) Reset adjustment bits.
- Page 12 1) Check the external wiring 2) Check status of the BUS LINK power indicator lamp (LED) of the TX2N-4AD4DA. The extension cable is properly connected. OFF or Flash: Check the connection of extension cable. Also check the 5V power supply capacity.
- Page 13 7) Check the output voltage or current value using a voltmeter or ammeter, and confirm that the output meets the I/O characteristics. If the output does not meet the I/O characteristics, adjust the offset and gain again. Note: To test the withstand voltage of the TX2N-4AD4DA, connect all the terminals to the grounding terminal.