Page 4.5
REED RELAY MODULE 40-110/115/120/125
pickering
SECTION 4 - PROGRAMMING GUIDE
MODULE ARCHITECTURE - 40-120-021
One sub-unit is used to control all the module’s relays as shown below. Enabling a particular bit opens the C to B
signal path and closes the C to A signal path.
40-120-021 (16 x SPDT Screened)
Sub-Unit
Bit
40-120-021 Signal Path
(with relay energised)
1
1
C1 to A1
1
2
C2 to A2
1
3
C3 to A3
1
4
C4 to A4
1
5
C5 to A5
1
6
C6 to A6
1
7
C7 to A7
1
8
C8 to A8
1
9
C9 to A9
1
10
C10 to A10
1
11
C11 to A11
1
12
C12 to A12
1
13
C13 to A13
1
14
C14 to A14
1
15
C15 to A15
1
16
C16 to A16
The 40-120-021 is an array of 16 uncommitted screened changeover relays. In the default state, all signal paths are
between the C terminal and the corresponding B terminal. Energising a particular relay disconnects the B terminal
and creates a signal path between the C and A terminals. The relay module’s switching architectures are shown in
their default state in the diagram below:
B2
A2
C2
S2
B16
A16
C16
S16
B1
A1
C1
S1
