Poll Command Message; Structure Of The Poll Command Message; Scaling - Advanced Energy Pinnacle User Manual

Pinnacle™ 20 kW
ensure that you have selected an appropriate MAC ID and baud rate. Finally, ensure
that you have read the following information about command and respond messages
and the DeviceNet LEDs.

POLL COMMAND MESSAGE

The Pinnacle DeviceNet interface uses DeviceNet's Group 2 I/O Poll Command
message (and the associated Group 1 I/O Poll Response message) to transfer low-level
I/O data between the device (slave) and the master. For more information about this
message, refer to section 7-6 of the DeviceNet specification (revision 2.0 or later). The
following table represents the structure of the poll command message.
Table 4-3. Structure of the poll command message
Byte
0
1
2
3
4
Note: In Bit 0 of Byte 4, PO refers to Power On. In this bit, 1 = turns on the unit's
output; 0 = turns off the units output.
Note: The 16-bit Power Output value (AI/AO) is shifted right four bits, and the
remaining four bits are filled with 0s. This changes the 16-bit AO to a 12-bit AO
with a value of 10 V = OFFF

Scaling

Parts of the message structure are based on binary representations of analog voltages.
Thus they have analog scaling associated with them.
The scaling for Power Output is 0 to 10 V, where 10 V = the full rated output power
capability of the Pinnacle 300 power system (master and slave units). Do not reset a
value higher than the power system's maximum output power capability. (Such
requests are always limited to the maximum output power capability of the power
system.) For information about determining your power system's maximum output
capability, see "Explicit Messaging" on page 4-9 .
The scaling for the Ramp Rate Setpoint (ramping-to-setpoint rate) is also 0 to 10 V as
follows:
• 10 V = 1 x power output setpoint per second
• 8 V = 0.8 x power output setpoint per second
• 5 V = 0.5 x power output setpoint per second
5702156-E
Bit 7 Bit 6 Bit 5
Power Output Setpoint AO (LSB)
0* 0* 0*
Ramp Rate Setpoint AO (LSB)
0* 0* 0*
I/O Communication and Control
Bit 4 Bit 3 Bit 2
0* Power Output Setpoint AO (MSB)
0* Ramp Rate Setpoint AO (MSB)
.
hex
Bit 1 Bit 0
PO
4-7