The MC41/42/43 looks like a great series of products, but I am reluctant to go with a 3 or 4 master system. When can we expect a series of expansion modules along the lines of the MC41/42/43? or am I stuck with the XA2 indefinately for current outputs?
Will the XC43 (when paired with the MC43FS) inputs to be allowed for use in Functional Safety Marked Function Groups in a future version of IqanDesign?
I'm thinking about controlling a motorized hydraulic pressure relief valve (the motor turns the pressure setting in and out) with two COUTs on an XA2 module. The motor was previously controlled with a couple of digital outputs and relays as an H-bridge. This is more of a XA2 hardware question; are the diodes necessary to protect the high side COUT as shown?:
Obviously only running either COUT A or COUT B at a time.
Or are diodes not needed?:
We are experiencing a problem with the HS+LS outputs on an XC44 module connected to an MC43 as the master running IQAN 6.07. Pin C1:46 as the HS and pin C1:41 as the LS.
The outputs are being used to activate a solenoid. The circuit was wired to run through a relay latched by system estop, with a diode placed across the solenoid to protect the outputs as in the documentation.
This circuit is able to latch and unlatch the solenoid with no problems, and this was repeatable many times. However when the system estop is pressed for the first time and the relay unlatches and breaks the circuit there is no error. When the relay is energized and the circuit is connected again, when the output is turned on a message is displayed reporting that the LS pin is overloaded. This message then triggers on either side of the estop from that point on. Key cycle is able to "reset" to the first estop cycle. This behavior happened ~9/10 times the cycle was repeated. There were some occasions where the error did not trigger.
The overcurrent error will only trigger when the output is requested, the estop relay can be re-energized connecting the circuit and no overcurrent is reported.
Current measurements were taken on the HS+LS wire to investigate. The current on this wire never approaches or exceeds the listed 2.5A. This is the only load on that pin grouping, the other 3 LS pins were not used.
We are designing our last machines with XC42 instead the phase-out XC10 and we are experiencing some issues.
One of them is related with the activation of some Inverter (Euradrives) and Soft Starters (ABB) digital inputs.
When the DOUT HS is directly connected to those high impedance inputs and the output is OFF, surely due to the leakage current, the Inverter and the Soft Starter interpret it as ON state, so they run untimely!
It is possible to reproduce this just wiring a DOUT HS to a DIN PD, the input will be ON all the time, even when the DOUT is OFF:
Also, when the inpedance is very high (not with XC42 DIN PD in this case), the DOUT HS is ON, the Open load error appears due to low consumption of the high impedance inputs, and this checking cannot be disabled in the IQAN...
We thought to add and extra resistor in parallel to the high impedance input to avoid this error, but we don't like this "solution", it can be really dangerous because if the resistor is broken or loosen, the devices will be running untimely!!
Our only solution was to add 24Vdc relays in the HS outputs and wire the contact of the relay to the high impedance inputs.
We think that the best solution would be the possibility of disabbling this leakage current for Open load ckeching in the DOUT HS. Is there any possibility of implanting it in future releases?
Thanks for your help and best regards,
We are going to be mounting an XC43 externally. The module and connector are rated for it, IP6K9K.
Has anyone else done this?
How does one go about neatly mounting external diodes for the digital outputs?
I need diodes that go between HS DOUTs to ground and between the pins of HS+LS DOUTS.
I am using a DOUT LS on XC23 to drive a 12V incandescent bulb on an instrument panel. In steady state, the lamp draws 85 mA. I am getting an overload on this output when I try to activate the lamp. I was able to temporarely solve the problem by using a 22 ohms in series with the load. So I believe the problem is the inrush current of the lamp. The instruction book of the XC23 clearly states that the LS DOUT "are designed to drive small loads, e.g. lamps and buzzers". The example even shows a lamp being driven by a LS DOUT.
Can you explain if I'm doing something wrong. If not, is there any fix available to solve this issue ?
We have an application which has an optional function group containing a DOUT on an XC23 module. This function group is enabled or disabled using a digital parameter. With the function group disabled we get the output grey and 'disabled' state when measuring with IQAN Design, which is correct:
We also have no errors on screen stating open load (we have nothing connected to output because this machine has not got the optional extra fitted). XC23 module has error code flash of DOUT, I suspect open load. Its not logging any errors or open loads in any logs within master module, viewing state of the module using IQAN Run I also get 'OK' and no errors on status screen just the LED status is showing incorrect state directly on the module:
If I delete the output from IQAN Design the error flash on the module disappears and it goes a steady amber flash, no errors.
Has this been fixed in a newer version? IQAN Design 5.06, MD4-5 M19 and XC23.
Customer support service by UserEcho