26- Series and 35-Series PowerLabs provide power and communication to ADInstruments Front-Ends via an I2C connection. It is possible to use multiple Front-Ends with one PowerLab by "daisy-chaining" the Front-Ends as shown in the image below.
When you are using multiple single channel Front-Ends, you can use as many Front-Ends as channels on your PowerLab, and the Front-Ends can be daisy chained in any order. However, when using at least one multiple channel Front-End such as a Dual Bio Amp or Quad Bridge Amp, the order of Front-Ends in the daisy chain must be carefully considered.
Each PowerLab has a fixed number of I2C slots. When a Front-End is connected to the PowerLab, it uses up a certain number of slots regardless of the number of used inputs. For example, an Octal Bio Amp will use up 8 slots even if you will only be using 1 input of the Front-End. If you are connecting two Octal Bio Amps and a Neuro Amp to a 16-channel, 35-Series PowerLab, be sure that the single-input Neuro Amp is not the last Front-End in the daisy chain, otherwise the Octal Bio Amps will use up all of the I2C slots and the Neuro Amp will not work properly.
For further technical assistance with this or any other issue, please contact ADInstruments Technical Support by clicking HERE.