8.1.7 Side screw specifications
Pin Hex button head security screw
d
1
M4
l 10 mm (0.39 in)
d
2
7.6 mm (0.30 in)
k 2.2 mm (0.09 in)
t min 1.3 mm (0.05 in)
s 2.5 mm (0.10 in)
d
3
max 1.1 mm (0.04 in)
8.1.8 Bottom screws 
specifications
The bottom screws can be:
l cheese head
l button head
Note: Avoid using countersunk head screws.
8.2 Terminal blocks and 
connector pin-outs
8.2.1 Digital inputs and outputs 
terminal block
Note: facing the control unit so that the terminal 
block is on the top left, number 12 is the closest to 
the control unit corner.
Terminal 
block
Symbol Description Pin
Digital In 4 Input 2, Channel 2, 24 
V dc type 3 - INPUT 
#2-2
1
3 Input 2, Channel 1, 24 
V dc type 3 - INPUT 
#2-1
2
2 Input 1, Channel 2, 24 
V dc type 3 - INPUT 
#1-2
3
1 Input 1, Channel 1, 24 
V dc type 3 - INPUT 
#1-1
4
V+ V+ (SNS), 24 V dc for 
diagnostics of the 
digital inputs 
(mandatory if at least 
one input is used)
5
V- V- (SNS), common 
reference for all digital 
inputs (mandatory if at 
least one input is 
used)
6
Digital 
Out
- GND, common 
reference for all digital 
outputs
7
4 Output 4 (OSSD4) 8
3 Output 3 (OSSD3) 9
2 Output 2 (OSSD2) 10
1 Output 1 (OSSD1) 11
- GND, common 
reference for all digital 
outputs
12
Note: the cables used must have a maximum length 
of 30 m (98.4 ft) and the maximum operating 
temperature must be at least 80 °C.
Note: use only copper wires with a minimum gauge 
of 18 AWG and a torque of 0.62 Nm (5,5 lbs in).
8. Technical references
LBK System Series| Instruction manual v1.2 SET 2021|SAF-UM-LBKBus-en-v1.2|© 2020-2021 Inxpect SpA
89