To specify the location and type of channel associated with the field measurement, you configure the channel type and the Device Signal Tag (DST) of the input or output parameter. The following channel types are available in Logic Solvers.
| Channel Type | Description | Function Block Use |
|---|---|---|
|
Analog Input Channel |
Reports the analog value present at the channel. |
Used with LSAI function blocks as input I/O references. |
|
HART Analog Input Channel |
Reports the analog value present at the channel and up to four digital values from a HART field device. |
Used with LSAI function blocks as input I/O references. Used with LSAI function blocks as readback references to read a 4 to 20 mA signal. |
|
HART Two-state Output Channel |
Drives a digital valve controller output device with an On value of 20 mA. The Off value is configurable: either 0 mA or 4 mA (to allow for HART communications). |
Used with LSDVC blocks to drive DVC6000ESD digital valve controllers. |
|
Discrete Input Channel |
Reports the discrete value present at the channel |
Used with LSDI function blocks as input I/O references when reading a discrete (On/Off) signal. Used with LSDO function blocks as a readback I/O reference for a discrete signal. |
|
Discrete Output Channel |
Drives the output to a discrete value and holds the output at that value. Outputs immediately reflect the output value that was received. Upon receiving a configuration that indicates a change from one type of output to another, the outputs switch to the off state. |
Used with LSDO function blocks as output I/O references when driving as discrete signal. |