Poll Command Message; Table 4-3. Structure Of The Poll Command Message - Advanced Energy Pinnacle 20 kW Manual

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 Bit 7
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
• 2.5 V = 0.25 x power output setpoint per second
• 0 V = No ramping rate specified; the Pinnacle unit ramps as fast as it can
If you request a ramping-to-setpoint value that exceeds 10 V, the setpoint will be limited to the
equivalent of 10 V.
5702199-A
Page 41 of 182
Bit 6 Bit 5
Power Output Setpoint AO (LSB)
0* 0* 0*
Ramp Rate Setpoint AO (LSB)
0* 0* 0*
.
hex
I/O Communication and Control
Bit 4 Bit 3 Bit 2
0* Power Output Setpoint AO (MSB)
0* Ramp Rate Setpoint AO (MSB)
Pinnacle™ 20 kW
Bit 1 Bit 0
PO
4-7