Qualitrol 509ITM Series, Manual

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The input modules installed on the expansion module are configured and set up exactly the way
the input modules are configured in the main 509ITM unit. See the input module section of the
manual for instructions.
All output relays, output current loops, data logging, event recording and communication protocols
can be configured to use all active installed input modules be they from the main 509ITM unit or
residing on the expansion module. The only difference is that measurement values from the
expansion module may take up to fifteen seconds to become active in the system. Therefore if you
require instant recognition of any measured values make sure those modules are installed directly
in the 509ITM unit.