Spectrum Controls 1794sc-IRT8I - Manual (Page 14)

2-4 Flex™ IO Isolated RTD/Thermocouple Module
User's Manual Pub. 0300242‐01 Rev. A
2.3.1 Wiring the Terminal Base Units (1794-TB3G shown)
!
Attention
Do not daisy chain power or ground from the terminal base unit to any
ac or dc digital module terminal base unit.
Daisy-chaining
Note: All modules must be frequency or IRT8I modules for this
configuration.
Wiring when total current draw is less than 10A
Individual
Note: Use this configuration if using any “noisy” dc digital I/O modules in
your system.
IRT8I module wiring separate from digital wiring
Power
Digital Input
Module
IF8u
Module
Digital Input
Module
24 VDC
24 VDC
24 VDC
Power
IF8u
Module
IF8u
Module
Frequency Input
Module
24 VDC