MT4412E Rev.3 15/10/2019 Page 20 of 30
2.4.1) STG/8REL relay expansion board
The STG/8REL 8-relay expansion board converts the O/C outputs of the STG/OUT16-S output
module into voltage-free exchange contacts. Up to two relay boards can be connected to each
output module. A relay board is directly connected to the output module (J1 connector) and a
second relay board is connected to the former.
Fig. 2.4.1) Relay board and connection to the output module
2.4.2) STG/IN8-S and STG/OUT16-S module addressing
STG/IN8-S and STG/OUT16-S modules are addressed using the two rotary switches in
RSW 1 and 2 hexadecimals. Rotary switches permit hexadecimal settings (base 16).
Each switch as 16 positions (0-F) and the pointer is positioned on the number chosen
using a screwdriver to create a decimal value between 1 and 255 (see table 1). See the
summary table in para. X for the maximum number of connectable modules to the central
unit. 1) INTRODUCTION
Each module must have univocal address in the system. Dual addresses are not
permitted even if modules are on different serial buses.
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