74 Rockwell Automation Publication 1444-UM001D-EN-P - June 2018
Chapter 2 Install the Dynamix 1444 Series Monitoring System
Connecting Speed Signals across Modules
When an external signal is used to serve multiple DYN modules, the
recommended wiring solution is as follows.
1. Wire the source signal to the TTL inputs on the first module, per Tacho
Inputs on page 66.
2. On the first module, wire one of its outputs to the TTL inputs. (#1) on
the next module per Opto-isolated (Open Collector) Outputs
on
page 58.
Example of wiring Discrete Output 0 to Tacho Input 0
Example of wiring Discrete Output 1 to Tacho Input 1
3. Daisy chain additional modules by repeating step 1 and step 2.
4. To output the TTL signal the wired opto-isolated output must be
configured to replicate the “Local TTL Tach 0 Input” or “Local TTL
Tach 1 Input”, as appropriate. See Hardware Configuration Page
on
page 111.
Use this method to daisy chain the external TTL signal to be sure that there is
isolation between modules. See Speed Signal Replication
on page 58 for more
information.
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