Johnson Controls Tyco Kantech KT-MOD-IO16, Installation Manual, Page: 19 / 26

KT-MOD-IO16 RS-485 Input/Output Module Installation Guide 19
SPI information
Each KT-MOD-IO16 can support 8 SPI relay modules, up to a total of 64 relays
(SPI) for each module. These can be with or without elevator control.
You can have a total of 32 SPI relay modules.
Power limitations from KT controllers
The specifications for KT-MOD-REL8 modules or multi-io modules apply up to a
maximum of 32 modules.
The KT controller can power only four KT-MOD-REL8 modules and one multi-io
module. If you add a fifth SPI-REL-8 module and activate all of the relays, the
KT-1 power supply opens causing a power failure on the entire module chain.
Use the KT-MOD-REL8 module input and jumper setting to add an external
power source.
The following figure illustrates the maximum system configurations.
Figure 8: Maximum system configurations