Siemens SIMATIC S7-200 System Manual page 350

S7-200 Programmable Controller System Manual
The Drive (drive address) input is the address of the MicroMaster drive to which the USS_CTRL
command is to be sent. Valid addresses: 0 to 31
The Type (drive type) input selects the type of drive. For a MicroMaster 3 (or earlier) drive, set
Type to 0. For a MicroMaster 4 drive, set Type to 1.
Speed_SP (speed setpoint) is drive speed as a percentage of full speed. Negative values of
Speed_SP cause the drive to reverse its direction of rotation. Range: --200.0% to 200.0%
Error is an error byte that contains the result of the latest communications request to the drive.
Table 11-6 defines the error conditions that could result from executing the instruction.
Status is the raw value of the status word returned by the drive. Figure 11-3 shows the status bits
for Standard Status Word and Main Feedback.
Speed is drive speed as a percentage of full speed. Range: --200.0% to 200.0%
Run_EN (RUN enable) indicates whether the drive is running (1) or stopped (0).
D_Dir indicates the drive's direction of rotation.
Inhibit indicates the state of the inhibit bit on the drive (0 -- not inhibited, 1 -- inhibited). To clear the
inhibit bit, the Fault bit must be off, and the RUN, OFF2, and OFF3 inputs must also be off.
Fault indicates the state of the fault bit (0 -- no fault, 1 -- fault). The drive displays the fault code.
(Refer to the manual for your drive). To clear the Fault bit, correct the cause of the fault and turn
on the F_ACK bit.
15 14 13
Reserved for future use: These bits might not always be zero
Figure 11-3 Status Bits for Standard Status Word for MicroMaster 3 and Main Feedback
336
High byte
12 11 10 9 8 7
1 = Drive warning present
1 = Not used (always 1)
1 = Serial operation allowed
0 = Serial operation blocked - - local operation only
1 = Frequency reached
0 = Frequency not reached
1 = Converter output is clockwise
1 = Converter output is counter-clockwise
Low byte
6 5 4 3 2 1
1 = Ready to operate
1 = Operation enabled
1 = Drive fault present
0 = OFF2 (Coast stop command present)
0 = OFF3 (Quick stop command present)
1 = Switch-on inhibit
0
1 = Ready to start