7334 digital i/o

[Gram]

Dear members,

I have with me:

1.A NI PCI-7334 Low Cost Stepper only Controller with a general-purpose 68 pin Digital I/O Connector to:
2.A 68VHDCI-50F SSR 8 Channel cable adapter further connecting to:
3.8-channel SSR series backplane with SSR-ODC-5 Output module (red colour) for digital conditioning on per channel basis

I simply want to configure the system to switch on a solenoid which is directly connected to the screw terminals on the backplane. However, I find the solenoid is always on. Could anybody advise me on this.

Many thanks.

[Jochen]

Is the SSR backplane powered?
Have you been able to turn the digital lines of the 7334 on and off (without SSR)?
Did you measure this?

Here you can find more information about this issue.

Best regards,

Jochen
National Instruments Germany

[Gram]

Thanks, Jochen

The SSR module backplanes is powered by the 7334 motion controller via a 68-pin digital I/O connector.

The LED lamps on the backplane can be turned on and off through LabVIEW vi.(with SSR?). I do not know whether it indicates I can turn the digital lines of the 7334 on and off. (my background is civil engineering).

[Jochen]

You need to power the SSR backplane with an external +5V power supply. Please refer to the SSR manual for the correct jumper setup.

Best regards,

Jochen

[Gram]

Thanks again, Jochen

The SSR manual says: To configure the SSR module backplane for external power or DAQ device power you need to set a jumper on the backplane. This can be just a wire jumper or it can be a fuse. If you use a wire jumper, you need to fuse the logic power supply somewhere before the backplane.

Can I directly supply power to the logic power supply (the two screw terminals)? If a fuse is definitely required, what is the size of it? I cannot find this information from the manual.

Besides, the jumper locations are slightly different from the Figure in the manual. The backplane I have is 70RCK8-HL.

[Gram]

Further to my previous questions.

A solenoid is connected to a pair of screw terminals. Even the backplane is not powered by either DAQ device or external power supply, the solenoid is ALWAYS on. However, 2 mega-ohms can be detected from the screw terminal pair without solenoid connected.

If the backplane is connected with 7334 controller via the 68VHDCI-50F SSR 8 Channel cable adapter, the LEDs can be turn on and off without any external power supply. Does it mean the backplane can be powered by ‘DAQ device’?

If an external power supply is definitely necessary, how much would be the fuse? Say, I have four 70-ODC5 SSR modules (however; only one is to be operating at a time in my application). The Max. logic supply current for 70-ODC5 is 14 mA as in the manufacture data sheet. The LEDS are the accessories needed to be considered as well? What is the current value they need?

Looking forward to hearing from you.

[Jochen]

As NI is just redistributing the Grayhill SSR series modules and backplanes sometimes the Grayhill documentation is a bit more accurate. The rear part of the SSR series manual contains the original Grayhill documentation.

If you don't use a fuse for the power supply you may risk your modules and your connected equipment in case of a short-cirucit. If you decide to use a fuse here is what the manual states about the current:

"The current needed for the SSR modules and accessories is the sum of the
maximum logic supply current of all SSR modules connected to the DAQ
device plus any other current needed by accessories connected to the same
DAQ device."

In your case you should replace "DAQ device" with "motion controller". Please refer to your modules' datasheets to find out about their power consumption.

Jochen

[Gram]

Many thanks Jochen,

I do not know why the latest questions I posted appear even earlier in the forum.

A solenoid is connected to a pair of screw terminals. Even the backplane is not powered by either DAQ device (in my case, motion controller) or external power supply, the solenoid is ALWAYS on. However, 2 mega-ohms can be detected from the screw terminal pair without solenoid connected.
Can it be off and how? If this is a problem of the backplane, what would possibly be the reasons?

If the LEDs can be turn on and off without any external power supply except the 7334 controller, does it mean the backplane can be powered by the controller?

I checked the Max. logic supply current for 70-ODC5 SSR modules is 14 mA in the Grayhill manufacture data sheet. And, are the LEDs needed to be considered as accessories as well? I cannot find how much power they consume from the original Grayhill documentation. What would be the current it requires?

[Jochen]

I couldn't find much better information but here is a pragmatic answer:
If you use a DAQ device you can power the backplane with the +5V from the DAQ device. This power supply is fused with 1A so I think this should be also ok for an external power supply.

Jochen

[Gram]

Thanks Jochen,

I will check it out with an external power supply together with a 1A fuse.