3.4
Definition of the Control Word
The control word is 16 bits long. Each bit has an inverter function assigned to it. The low byte
comprises 8 function bits with a permanent definition each, which are always valid. The assignment
of the more significant control bits varies for the different control words.
Functions, which the inverter does not generally support, cannot be activated via the control word
either. In this case the individual control word bits are to be considered as reserved bits and set at
logical 0 by the user!
3.4.1
Basic Control Block
The less significant part of the control word comprises 8 function bits, to which the most important
drive functions are permanently assigned. Fig. 11 shows the basic control block assignment.
Functionality of the single control bits:
Bit:
Functionality
Assignment
0
Controller inhibit
0 = Enable
1 = Inhibit controller, activate brake
1
Enable/Rapid stop
0 = Rapid stop
1 = Enable
2
Enable/stop
0 = Stop with generator ramp or process ramp
1 = Enable
3
Hold control
*)
0 = Hold control not active
1 = Hold control active
4
Ramp generator selection
0 = Ramp generator 1
1 = Ramp generator 2
5
Parameter set selection
*)
0 = Parameter set 1
1 = Parameter set 2
6
Reset
0 = Not active
1 = Reset fault
7
Reserved
Reserved bits are to be set to zero!
*)
Not possible to assign bits to zero for MOVITRAC
®
31..., size 0
The input terminals remain generally active, also in the FIELDBUS control mode. Safety-relevant
functions such as
Controller Inhibit and Enable are processed with equal priority both by the terminal
strip and the fieldbus, i.e. for fieldbus control of the inverter, the inverter must first be enabled on the
terminal side (Fig. 12). All other functions, which can be activated both via the terminals and via the
control word are processed as OR functions.
Controller inhibit/Enable
Enable/Rapid stop
Enable/Stop
Ramp generator selection
Parameter set selection
Reserved
Hold control
Reset
permanently defined
Control word dependent
15 14 13 12 11 10 9
8
7
6
5
4
3
2
1
0
00321AEN
Fig. 11: Basic control block for all control words
3
Inverter Control
with Process Data
MOVITRAC
®
31.. Fieldbus Unit Profile
25
Phone: 800.894.0412 - Fax: 888.723.4773 - Web: www.clrwtr.com - Email: [email protected]
