Technical Bulletin

PROFIBUS-DP External Communication Cards
PowerXL DG1 Series VFD MN040010EN—May 2014 www.eaton.com 87
Control and Status Words
The Control Word (PROFIBUS Parameter number (PNO) = 967)
is the principal means for controlling the drive from a fieldbus
system. It is sent by the fieldbus master station to the drive,
the adapter module acting as a gateway.
The drive switches between its states according to the
bit-coded instructions on the Control Word, and returns
status information to the master in the Status Word
(PROFIBUS Parameter number (PNO) = 968).
Control Word 1 (STW1)
To improve the exchange of devices of different
manufacturers in a control application, we strongly
recommend using the device-specific bits only for the control
of manufacturer specific functions. The device-specific bits
shall not be necessary for the operation of a device in the
speed control mode and in the positioning mode (default of
the device-specific bits = 0).
Table 108. PROFIdrive Control Word 1—STW1
Bit Value Significance Comments
0 1 ON “Switched on” condition; voltage at the power converter, i.e. the main contact is closed (if present).
0 OFF (OFF 1) Power-down (the drive returns to the “ready for switching on “condition); the drive is ramped-down
along the ramp (RFG) or along the current limit or along the voltage limit of the d.c. link; if standstill is
detected, the voltage is isolated; the main contact is opened (if present). During deceleration bit 1 of
ZSW1 is still set.
An OFF command is interruptible.
1 1 No Coast Stop (no OFF 2) All “Coast Stop (OFF2)” commands are withdrawn.
0 Coast Stop (OFF 2) Voltage is isolated.
The main contact is then opened (if present) and the drive goes into the “Switching On Inhibited”
condition; the motor coasts down to a standstill.
2 1 No Quick Stop (no OFF 3) All “Quick Stop (OFF3)” commands are withdrawn.
0 Quick Stop (OFF 3) Quick stop; if required, withdraw the operating enable, the drive is decelerated as fast as possible, e.g.,
along the current limit or at the voltage limit of the d.c. link, at n / f = 0; if the rectifier pulses are
disabled, the voltage is isolated (the contact is opened) and the drive goes into the “Switching On
Inhibited” condition.
A Quick Stop command is not interruptible.
3 1 Enable Operation (Start) Enable electronics and pulses.
The drive then runs-up to the set point.
0 Disable Operation (Stop) The drive coasts down to a standstill (ramp-function generator to 0 or tracking) and goes into the
“Switched on” condition (refer to control word 1, bit 0).
4 1 Enable Ramp Generator
0 Reset Ramp Generator Output of the RFG is set to 0. The main contact remains closed, the converter is not isolated from the
line, the drive decelerates along the current limit or along the voltage limit of the d.c. link.
5 1 Unfreeze Ramp Generator
0 Freeze Ramp Generator Freeze the actual set point entered by the ramp-function generator. If Application Class 4 is used Bit 5 is
not relevant.
6 1 Enable Set point The value selected at the input of the RFG is switched-in.
0 Disable Set point The value selected at the input of the RFG is set to 0.
7 1 Fault Acknowledge (0
R1) The group signal is acknowledged with a positive edge; the drive reaction to a fault depends on the type
of fault. If the fault reaction has isolated the voltage, the drive then goes into the “Switching On
Inhibited” condition.
0 No significance
8 1 Jog 1 Ona Prerequisite. Operation is enabled, drive is in standstill and STW1 bit 4, 5, 6 = 0. The drive runs up along
the ramp of RFG to jogging set point 1.
0 Jog 1 OFFa Drive brakes along the ramp of RFG, if “Jog 1" was previously ON, and goes into “Operation Enabled”
when drive comes to a standstill.
9 1 Jog 2 Ona N/A
0 Jog 2 OFFa N/A