3 - 3                 3 - 3 
MELSEC-Q 
3   OUTPUT MODULE SPECIFICATIONS 
3.3 QY18A Contact Output Module (All Points Independent) 
Type 
Specifications 
Contact output module (All points independent) 
QY18A Appearance 
Number of output points  8 points 
 
Isolation method  Relay isolation 
Rated switching  
voltage/current 
24VDC 2A (resistive load) 
240VAC 2A (cos =1) 
/point, 8A/unit 
Minimum switching load  5VDC 1mA 
Maximum switching load  264VAC 125VDC 
Response 
time 
OFF to ON  10ms or shorter 
ON to OFF  12ms or shorter 
Life 
Mechanical  20 million cycles or more 
Electrical 
Rated switching voltage/current load 100 thousand cycles or more 
200VAC 1.5A, 240VAC 1A (COS =0.7) 100 thousand cycles or more 
200VAC 0.4A, 240VAC 0.3A (COS =0.7) 300 thousand cycles or more 
200VAC 1A, 240VAC 0.5A (COS =0.35) 100 thousand cycles or more 
200VAC 0.3A, 240VAC 0.15A (COS =0.35) 300 thousand cycles or more 
24VDC 1A, 100VDC 0.1A (L/R=7ms) 100 thousand cycles or more 
24VDC 0.3A, 100VDC 0.03A (L/R=7ms) 300 thousand cycles or more 
Maximum switching 
frequency 
3600 cycles/hour 
Surge suppressor  None 
Fuse None 
Dielectric withstand voltage  2830VAC rms/3 cycles (altitude 2000m) 
Insulation resistance  10MΩ or more by insulation resistance tester 
Noise immunity 
By noise simulator of 1500Vp-p noise voltage,  
1 s noise width and 25 to 60Hz noise frequency 
First transient noise IEC61000-4-4: 1kV 
Protection degree  IP1X 
Number of occupied I/O 
points 
16 points (I/O assignment is set as a 16-point output module.) 
Operation indicator  ON indication (LED) 
External connections 
18-point terminal block (M3 6 screws) 
Applicable wire size 
Core cable 0.3 to 0.75mm
2 
(Outside
 
diameter 2.8mm or smaller) 
Applicable crimping terminal  R1.25-3 (Sleeved crimping terminals cannot be used.) 
Internal current consumption 
(5VDC) 
240mA (TYP. all points ON) 
Weight 0.22kg 
 
External connection  Terminal block No.  Signal name  
 
TB1 
Y00 
TB2 
TB3 
Y01 
TB4 
TB5 
Y02 
TB6 
TB7 
Y03 
TB8 
TB9 
Y04 
TB10 
TB11 
Y05 
TB12 
TB13 
Y06 
TB14 
TB15 
Y07 
TB16 
TB17 Vacant 
TB18 Vacant 
 
 
QY18A
24VDC
01234567
89ABCDEF
0
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
L
7
L
6
L
5
L
4
L
3
L
2
L
1
L
0
NC
NC
2A
240VAC