Toshiba RT318 User Manual
RT318
y
8-channel RTD input
Type RT318
Category RTD ( Resistance Temperature Detector ) input
Resistance temperature
detectors
Measuring method Three-wire system
Load current 1 mA
Temperature measurement
range
Converted data 800 to 4000
Input channel 8 channels / module
Insulation Photo-coupler insulation (not isolated between the channels)
Conversion rate 400 ms / 8 channels
Resolution
Wire resistance correction
range
Overall accuracy ±
Tepaerature drift ±
Internal current consumption 5 Vdc, 600 mA or less
Insulation resistance
Withstand voltage 500 Vac, 1 minutes ( between internal and external circuits)
Weight 500 g
Internal circuit
1A
1B
CH1
1C
1G
8A
8B
8C
CH8
8G
Pt100
-50° to +270°C (-58° to +518°F)
12 bits / 0.025 % ( 0.1 °C / count )
Within 4Ω
0.3 % (at 25 °C)
100 ppm / °C
10 MΩ (500 Vdc)
Current source
1 mA
1 mA
Rref
AG
Input filter
Multiplexer
Rref
AG
AMP
ADC
Wire break
detection
+15V
-15V
DC/DC
0V
PC : Photo-coupler
PC
PC
5 Vdc
Buffer
memor
Internal circuit
1
Terminal connections
Terminal
No.
1 (NC) No Connection
2 (NC) ( do not connect any wire )
3 (NC)
4 (NC)
5 (NC)
6 (NC)
7 1A
8 1B RTD input channel 1
9 1C
10 1G
11 2A
12 2B RTD input channel 2
13 2C
14 2G
15 3A
16 3B RTD input channel 3
17 3C
18 3G
19 4A
20 4B RTD input channel 4
21 4C
22 4G
23 5A
24 5B RTD input channel 5
25 5C
26 5G
27 6A
28 6B RTD input channel 6
29 6C
30 6G
31 7A
32 7B RTD input channel 7
33 7C
34 7G
35 8A
36 8B RTD input channel 8
37 8C
38 8G
Terminal
name
Function
N.C.
N.C.
N.C.
1B
1G
2B
2G
3B
3G
4B
4G
5B
5G
6B
6G
7B
7G
8B
8G
2
4
6
8
10
12
14
16
18
20
22
24
26
28
30
32
34
36
38
1
3
5
7
9
11
13
15
17
19
21
23
25
27
29
31
33
35
37
RT318
N.C.
N.C.
N.C.
1A
1C
2A
2C
3A
3C
4A
4C
5A
5C
6A
6C
7A
7C
8A
8C
2
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