Impulse SCMD-PB4 User Manual
Sspecification, Discrete i/o mounting boards, Phone
(0.75)
19.1
(2.2) 55.9
Swaged
Standoff
thru Hole
(0.15) 3.2
Diameter
WRC4-A4T & 1781-A4T
Discrete I/O Mounting Boards
1
Phone
(330) 762-
Fax:
(330) 762-
E-mai
SALES@
wrcakron.c
Webs
http://www
wrcakron.c
S
SPECIFICATION
Power Side
Signal Side
Bit
Pos.
Neg.
Signal
DC Return
Bit 0
2
3
3
2
Bit 1
4
5
5
4
Bit 2
6
7
7
6
Bit 3
8
9
9
8
NOTES:
1. Signal-side +Vcc (terminal 1) supplies +5, +15 or +24 V dc logic voltage.
2. Logic-side dc return is connected to all even terminals on the signal side.
3. Signal terminal is pulled up to +Vcc when not asserted, and pulled down to dc return when asserted.
4. Power-side terminals are polarized for dc applications, and non-polarized for ac applications.
5. Power-side terminal 1 is not connected on 1781-A4T.
MM (in)
6.4
(.25)
0
1
2
3
1
9
1
9
101.6 (4.0)
114.3 (4.5)
76.2
(3.0)
88.9
(3.5)
Pull-up
Resistor
3.3K Typ
Spare
Power Side
Module Input/Output
Output
Barrier
Strip
Output
Barrier
Strip
1
2
3
4
5
6
7
8
9
1
2
3
4
5
1
2
3
4
1
2
3
4
1
2
3
4
LED typ.
Fuse
5A
Typ.
1
2
3
4
5
6
7
8
9
Signal Side
Module Input/Output
DC
Return
+VCC
5
5
5
101.6 (4.0)
6.4 (.25)
mm (in)
114.3 (4.5)
76.2 (3.0)
88.9 (3.5)
1781-A4T
1781-
A4T
WRC4-A4T and 1781-A4T mounting boards can be used with up to four WRC4-series
I/O modules (WRC4-A4T) or four standard, slim or miniature I/O modules (1781-
A4T). The barrier strips on the 1781-A4T accept ring or spade lug, while they both
accept insulated wire with stripped ends or ferrules. Each power side point is indi-
vidually isolated. The signal side has a common dc return and common logic supply
bus (+Vcc) for negative-true logic applications. They are designed for panel mount-
ing with four stand-offs. Specify 1782-A4T or WRC4-A4T-DIN for mounting on DIN
rails such as the WRC50022.
MOUNTING DIMENSIONS
SCHEMATIC DIAGRAMS
WRC4-
A4T
WRC4-A4T
SCMD-PB4