S7 1200 PLC sinusoidal signal + Motion CTRL

peter jenny

hello sir,i'm a new student to plc world...

Resolver generate a sinusoidal waveform sin & cosine signal can connect to S7 1200 Plc without R/D Converter to control the motion(positioning & velosity)..........
if it not possible to interface a resolver to s7 1200 plc to control the motion.....& which type plc to use to interface the resolver....?


I Have another question sir.........
actually plc will take analog inputs/outputs to control the output value......but analog also a sinusoidal signal naa.....?sir


Thanks ur help sir.......

Hello,
1st thank you.

what i know is that in the case of 9300 we will talk about 5 types of servodriver:

I: SERVO PLC
K: SERVO CAM PROFILER
P: SERVO POSITION CONTROLLER
R: REGISTER CONTROLLER
S: SERVO INVERTER
T: SERVO PLC TECHNOLOGY

the servodriver what am talking about is 9300 standard actually it's controlled by analog signal +/-10V using positioning module AXM 126 and TSX67 as API.

so, this is why i think that a motion ctrl need to be included in the PLC program if i want to use PWM or profibus solution instead of a module position.

what's the accurate you got with 9400? for me the main task is to conservean accurate of 1mm regarding of the mechanical system.

Sincerely

Hello,

Thank you.

Unfortunately dear friend in the last link they used a 9300 servo position.

Check paragraph ‘2.4.2 Lenze 9300 Positioning Servo Drive’ in the same doc (equivalent to page 34/113 and 35/113).

<We’re speaking about Point-to-point positioning with or without velocity changeover. Touch probe positioning. Absolute or relative positioning. Homing according to different modes. Manual homing. Manual positioning. Manual positioning with intermediate stop.>
so, those functions are included in 9300 servo position and am using 9300 standard

below, this is a link of 9300 servo position manual system.

‘Panic word’ will be less to describe my actual state

http://src.lenze.com/lenze-bibliothek/en/B1%20-%20Servo%20Technology/B11%20-%20Servo%20inverter_9300/SHB_9300_Servo_position_controller_v3-0_EN.pdf

Why we don’t have to worry about precision in 9300 servo driver. The mechanical system isn’t ideal. So, we there’ll be disturbances. You know, positioning a carriage to position an angle for punching & cutting operations is not an easy task. Maybe it’ll work for 1 or 2 cycles. But can we maintain and guarantee the same positioning for 1000 cycles of operations? A PLC motion ctrl with close loop will not be necessary?

My last question is: in the analog inputs +/-10V of servodriver what we send from a positioning module velocity or position or both?

I don’t know where to start. Maybe I should just use FM354 instead of wasting time to search for something that will not work. The problem is that in this case I’ve to use S7-31x CPU and also try to set a communication with S7-1200. Oh! Lot of work and it’ll be also the 1^st time for me to deal with that.

I don’t know if we could get access to FM354 from S7-1200 using just an IM without the need of S7-31x CPU ?

I got more pressure here, one month seems just like one week

Best regards.

Hello,

also i just received an explanation from Lenze. so, the entire msg is:

It sounds like you want to control an EVS9300-ES using a master frequency for positioning to replace the old +-10V system. It is possible to control the 9300 using Pulse and Direction from the controller. In this mode, the drive monitors the pulse input and adjusts its position based on that signal. Because the drive does not know the absolute position, the position loop must be closed elsewhere (such as in the PLC). To be able to send a position over Profibus, you would need a 9300 EP to handle the position loop within the drive.

so,what possibilities remains for me?

Thank you

I see now, FM354 is not the way you should go because its too expensive, you rather change servo drive with positioning drive.
Now I dont't understand if you have a permanent magnet motor or an induction motor.
+/-10V usualy is for speed command or torque command, not the position.
The easiest way to go would be to set your 9300 in slave followingmode (electrical shaft), if possible. If you have an encoder that has differential quadrature output A, /A, B, /B you can check if it is working.
Or you can also try to solder a SN75ALS191 differential driver or similar, so you can send PTO pulses from PLCto your servo drive. The main advantage would be driving a servo in a open loop and let him to do the velocity and torque loop, PLC isn't as fast as DSP of servo drive.

Hello,

i have a lenze servomotor MCA14L35, check the link below page 2/32 3rd line on the 1st table.

http://www.ctiautomation.net/pdf/lenze/lenze-mca-asynchronous-servo-motors.pdf

the servomotor have to handle the positionning of an angle trough a carriage for marking, punching and shearing operation. there'll be also 5 clamps to maintain the angle before each operation.
1 clamp upstream to each unit.

1 marking unit
4 punching unitsand only one unit will work at time
1 shearing unit

a precisionnot exceeding1mm is a must have.

the program will sendthe receip of operations. we will have a series of positions and which unit will work in a corresponding position.

and also with the carriage we doalength measurement of the angle. only at the 1ststart of1 cycle of production. (for example at 1 cycle we could produce 1000 angle with a same defined profil)

it'll be more economic if i use 9400 servodriver instead of adding FM354 + S7-31x CPU?
can i ensure this kind of task with?

Best regards