# Comparison GD and PCD profile

Navigation: Valve Firmware > Interface > DeviceNet > Profile > # Comparison GD and PCD profile |

Function | Generic Device | Process Control Device
S-Analog Sensor Instances | ▪Pressure ▪Position | ▪Sensor 1 ▪Sensor 2 ▪Position
Data Units Pressure | ▪Counts ▪Percent | ▪Counts ▪Percent ▪Psi ▪Torr ▪mTorr ▪Bar ▪mBar ▪Pa ▪atm
Data Units Position | ▪Counts | ▪Counts ▪Percent ▪Degrees
Set Point Type | Class 51, Instance 0, Attribute 8 Data Length 1 Byte Value: 0=pressure, 1=position | Class 46, Instance 1, Attribute 14 Data Length 2 Byte Value: 0=none,1=pressure, 2=position
Poll Output Assembly | Class 5, Instance 2, Attribute 100 | Class 5, Instance 0, Attribute 100
Poll Input Assembly | Class 5, Instance 2, Attribute 101 | Class 5, Instance 0, Attribute 101
Bit Strobe Produce Assembly | - | Class 5, Instance 0, Attribute 102
COS/Cyclic Produce Assembly | Class 5, Instance 4, Attribute 101 | Class 5, Instance 0, Attribute 103
Sensor Setup | Sensor Mode, Sensor Factor | Sensor Full Scale, Sensor Unit (or Sensor Mode, Sensor Factor)
Learn | Service 100 in Class 51 Start with 0, Stop with 1 | Service 99 in Class 51 Start with 1, Stop with 0
Additional Attributes and Functions |  | ▪Alarm / Warning Bands ▪Sensor Crossover ▪Process Variable Source ▪Control Direction ▪…
Firmware Download | No | Yes
Configuration and Read via Service Interface | No | ▪Sensor 1 Gain ▪Sensor 2 Gain ▪Position Gain ▪Position Units ▪Pressure Units ▪Data Type ▪Poll Input ▪Poll Output ▪Factory Reset ▪Reset ▪Exception Status ▪Device Stats
Exception Detail | Device Exception Size: 5 Device Exception: Sensor Expt. Manufacturer Byte#5: FE Value | Device Exception Size: 4 Device Exception: not used Manufacturer Byte#5: FE Bits