4.2.3 10-point I/O expansion module
Chapter 7. Usage of Various Functions
7.2 Special Modules
7.2.4 Analog timer
1) Performance specification
The performance specifications of the analog timer module are following.
Item Specifications
Number of channels 4
Output value range 8 bits (Digital output range: 0 200)∼ Setting type Setting by variable resistance Accuracy of timer ±2.0% (Accuracy about max. value)
Internal current consumption
50 ㎃
Weight 200g
Analog module #1 Analog module #2 Analog module #3 A/T conversion
value data register %MW4160~%MW4163 %MW4164~%MW4167 %MW4168~%MW4171
2) Names of parts and functions
No. Name Function
① RUN LED
Indicate the operating status of G7F-AT2A.
On: normal operation Off: DC 5V power off
② Channel Setting up the length of timer through variable resistance to every channel
③ Extension cable A cable to connect analog timer module
④ Extension cable
connector A connector to connect expansion cable
①
②
③ ④
3) Program example (1) Program
Program which controls on-delay time of output contact point within 0 to 200 ms by analog timer module. Timer T000 starts to count and turns on %QX0.0.0 when it reaches the value of %MD100.
(2) System configuration
Main unit Analog timer module
(3) Program
7-70
7.2.5 RTD input module
1) Performance specification
The performance specifications of the RTD input module are following.
Item Specifications
Connectable RTD Pt 100 (JIS C1640-1989, DIN 43760-1980) JPt100 (KS C1603-1991, JIS C1604-1981) Temperature input
range
Pt 100: -200 ~ 600 (18.48 to 313.59℃ Ω) JPt100: -200 ~ 600 (17.14 to 317.28℃ Ω) Digital output Digital conversion value: 0 ~ 4,000
Detected temperature value: -2000~6000(one digit after point X 10) Burn out detection Three wires at every channel has detection function respectively
Accuracy ±0.5% [Full Scale]
Maximum conversion
speed 40 scan / all channel Temperature input point 4 channel / 1 module
No. of module installation
Max. 3 modules
Insulation Photo-coupler insulation between the input terminal and the PLC power supply (non-insulation between channels)
Connection terminal
block 2 of 8 points terminal Current consumption 25 ㎃
Voltage DC 21.6 26.4V ∼
① RUN LED Indicates the operating status of G7F-RD2A.
② RTD input
terminal Terminal which connects Pt100 or JPt100
③ External power input terminal
Supply external voltage DC 24V
④ Extension cable This cable is used to connect while RTD input module is used.
④ Extension cable connector
The connector connects extension cable when extended module is used.
③ ②
3) Parameter settings
4) Special data register
Ch. Detected
Temperature value
Digital conversion
value Remark
0 %MW4120 %MW4100
1 %MW4121 %MW4101
2 %MW4122 %MW4102
3 %MW4123 %MW4103
Analog module #1
0 %MW4124 %MW4104
1 %MW4125 %MW4105
2 %MW4126 %MW4106
3 %MW4127 %MW4107
Analog module #2
0 %MW4128 %MW4108
1 %MW4129 %MW4109
2 %MW4130 %MW4110
3 %MW4131 %MW4111
Analog module #3 Select scale for digital value
7-72 5) Error codes (%MW4140 ∼ %MW4151)
Error codes are saved in order from %MW4140.
6) Temperature conversion characteristics
The RTD input module, as shown below, linearlizes the non-linear characteristic resistance input of the RTD.
Error code Description Corrective action
0 Normal run status ⎯
16(10h) A disconnection detected Fix the A disconnection between RTD input module and RTD.
17(11h) B disconnection detected Fix the A disconnection between RTD input module and RTD 18(12h) b disconnection detected,
A and B disconnection detected simultaneously.
Fix the b disconnection between RTD input module and RTD. Or, Fix the A and B disconnection.
19(13h) Temperature outside the range
Correctly specify the type of the RTD, or use the temperature within the range (-200.0°C ~ 600.0°C)
7) Digital conversion value
The RTD input module, as shown below, outputs digital converted value of detected temperature value.
(Range 0 ~ 4000)
Digital Conversion value = (Detected Temp. value+2000)/2
Example) Assume that Detected temperature value(D4980) is 2345, then real temperature = 234.5℃, and Digital conversion value(D4770) is (2345+2000)/2 = 2172.
8) Burn-out detection function
The RTD input module has the function of burn-out detection on the Pt100, JPt100 or cable.
• As shown below, if disconnection occurs in the RTD or cable then a voltage outside the measurable range voltage is inputted by the internal burn-out detection circuit and burn-out detection error code is generated.
• The RTD input module can detect disconnection for each channel. But, burn-out detection is possible only in the channels enabled.
• If disconnection is detected in two or more wires, first, disconnection error code is generated by ‘b’ and then disconnection error code is generated by ‘A’ or ‘b’ sequentially. If disconnection is detected simultaneously in ‘A’ and
‘B’, only disconnection error code is generated by ‘b’.
Connection
Method Connection Example Remark
2-wire type
3-wire type
- In 4-wire type, only all wires marked '2' connected to the terminal block A are all detected as disconnection then the A disconnection error can be detected.
4000
-2000 6000
Digital conversion value
0
burn-out detection burn-out detection area
7-74
• Make sure that external input signal of the mixture module of AC and analog I/O is not affected by induction noise or occurs from the AC through using another cable.
• Wire is adopted with consideration about peripheral temperature and electric current allowance. Thicker than Max. size of wire AWG22 (0.3 ㎟) is better.
• If wire is put near to high temp. radiated device or contacted with oil for a long time, it may cause of electric leakage so that it gets broken or miss-operation during wiring.
• Be sure to connect with care of polarity while connecting to external 24V DC power supply.
• In case of wiring with high voltage line or generation line, it makes induction failure so then it may cause of miss-operation and out of order.
(2) Wiring example
• Number of method of connection between Pt and RTD input module are three, that is, 2-wired type, 3-wired type and 4-w wired type.
• The resistance of the wires used to connect Pt to RTD input module should be 10 Ω or less per wire.
The same wire (in thickness, length, and kind, etc.) should be used for each channel.
Connection
Method Connection Example Wire Conditions
2-wired type
3-wired type
ℵ wire resistance≤ 10Ω ℑ wire resistance≤ 10Ω ℜ wire resistance≤ 10Ω
The difference between the resistance values of the wires ① and ② : 1Ω or less
The difference between the resistance values of the wires ② and ③ : 1Ω or less The difference between the resistance values of the wires ③ and ① : 1Ω or less
burn-out detection
4-wired type
Method of Connection between Pt and RTD Input Module
*1: RTD (Pt100 or JPt1000)
*:2: Shielded wire - The shields of the RTD and shields of wire should be connected to the FG of the RTD input module.
REMARK
The difference between the resistance values of the wires used should be 1 Ω or less, or the accuracy shown in 1) Performance specification could not be satisfied.
10) Program example
(1) A program for output of detected temperature value as a BCD value a) Program explanation
The present A/D conversion value of the detected temperature value which is detected from the temperature-measuring resistor Pt 100 is displayed on the BCD digital display by use of channel 0 of the temperature-measuring resistor input module. The lamp turns on when the detected temperature value is a negative number and turns off when it is a positive number
b) System configuration and parameter setting
RTD input module
Turns on when temperature value is negative (%QX0.0.8) BCD segment
( %QX0.0.0~%QX0.0.7) Detected temperature
Input condition (%IX0.0.0)
COM0
7-76 c) Program