4
votes
Accepted
Can anyone identify this manufacturer? "E3"?
Dunno about the logo, but it's a Hartmann part number.
There's been a lot of consolidation in the electronics industry- maybe they bought someone up before being swallowed up themselves by Phoenix ...
- 379k
4
votes
Can anyone identify this manufacturer? "E3"?
Not a proper answer, but I was interested to see if a logo search would show up anything so I created one in Inkscape and dropped it and its negative into Google's Image Search. No joy. They may be of ...
- 170k
4
votes
Accepted
What is this SOIC-8 part from ST?
How about the ST LM393?
https://www.st.com/en/amplifiers-and-comparators/lm393.html
There are ordering codes that are in a SOIC package and just marked "393". The second row could be ...
- 18.4k
3
votes
What makes transconductance negative?
More properly, the transconductance gain is -1 A/V.
A transconductance amplifier has a high-impedance input, and it responds to a voltage on that input, while using minimal* current. It has a high-...
- 45.1k
3
votes
What makes transconductance negative?
Quoting from the same answer, next sentence: "It's minus only to avoid messy looking wire crossings in the image."
- 31.2k
2
votes
IO link sensors with PLC
When using IO link technology with a PLC (siemens s7-1200) can you connect devices that are not IO link sensors?
For example say I wanted to connect an existing normal push button to a IO link master
...
- 168
2
votes
Accepted
Thyristor T901N
70°C Tc is the case temperature so you have to consider the heat sinks, air flow and ambient temperature as well as thermal resistance from case to heatsink.
The power dissipation of a thyristor in a ...
- 379k
1
vote
Accepted
I Need help to find what smd component is this?
Possibly a common BC817-40 or similar https://assets.nexperia.com/documents/data-sheet/BC817_SER.pdf
- 379k
1
vote
What makes transconductance negative?
Transconductance is not, in general, negative. The transconductance of the specific amplifier in the question you link is negative, but in general transconductance can be either positive or negative. ...
- 27.9k
1
vote
Contacts on Safety Relay
Contact numbering follows the format
XY
Y = 1/2 (normally closed) or 3/4 (normally open).
X = contact number 1, 2, 3, etc.
simulate this circuit – ...
- 170k
1
vote
ASi (AS-Interface), understanding power supply
The resistors perform a weak pull from each side to ground. I don't know why they've labeled it as "shield" as AS-i cable doesn't have a shield. In the systems I'm familiar with the centre ...
- 170k
1
vote
Accepted
Is it possible to change counter signal to analog signal in Siemens Logo?
I've done this using the Mathematical instruction.
...
- 170k
1
vote
IO link sensors with PLC
say I wanted to connect an existing normal push button to a IO link
master, is it possible to cut the plug of the IO link cable and
connect the button with the 3 required cores
No. You would need to ...
- 3,560
1
vote
IO link sensors with PLC
An IO-Link system consists of an IO-Link master and one or more
IO-Link devices
That's a quote from Wikipedia IO-Link and basically it means that master and slaves have to be compatible: -
An IO-...
- 437k
1
vote
TIA portal - failed to establish a connection
Nothing special, TIA is a master of troubles and issues. First, make a correct settings for your PC ethernet NIC, make the IPv4 to be in the same subnet, for example 192.168.0.150. Then plug the cable ...
- 23.6k
1
vote
Accepted
PLC s7-1200 Ladder logic
Figure 1. Timer operation pages shows that ET, elapsed time, stops when the PT, preset, time is reached. From that we can deduce that we will never get ET > PT.
On the basis of the above information
...
- 170k
1
vote
Accepted
Understanding ladder PLC logic
If you have a latter version of TIA that allows mixing LAD and SCL you can add a simple code, instead of LAD:
...
- 23.6k
1
vote
Understanding ladder PLC logic
is it sequential like c/c++?
No, with typical column scan pattern* it is evaluated top-to-bottom and left-to-right. This means, first all of column 1 is evaluated from row 1 to end, then column 2 is ...
- 22.1k
1
vote
Accepted
Finding current over controllable voltage source using nodal analysis
These two are obvious by inspection:
$$\begin{align*}
V_3&= 13 \:\text{V}\\\\
V_0&= V_2
\end{align*}$$
These are from simply writing out the nodal equations:
$$\begin{align*}
V_1\cdot 1\:\...
- 77.2k
1
vote
Switching outputs using ladder logic
Your screen grabs are too difficult to read.
It sounds as though you are looking for a 60 s clock with 50% duty cycle. The normal method is to generate a timing sequence as follows:
...
- 170k
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