Industry Online Support
Technical Forum
Navigation
Rating 
Thanks 1
5 Entries
| 3/19/2012 3:49 AM | |
Joined: 5/6/2008 Last visit: 8/1/2024 Posts: 57 Rating:
|
dear all: Please see the Manual of <SIMATIC S7-300 S7-300 Automation System Module Data>,at the following link. http://support.automation.siemens.com/CN/view/en/8859629 I have two question: 1.Page373 It is technical data about 6ES7331-7PF01-0AB0,the max input cable length is 200m, what is the range of the diameter for the conductor? 2.Page434, It is technical data about 6ES7332-5HF00-0AB0,the load impedance for current outpout is max. 600 Ω at CMV < 1 V.Why is it limittedthe CMV(between S- and MANA )<1V?What can i do,if the CMV>1V? |
| 3/19/2012 6:47 AM | |
Joined: 5/28/2008 Last visit: 9/9/2024 Posts: 4515 Rating:
|
Hello, As Darius replied for this subject, it's related to current. For analog channels, 0.5 mm2 is fine. Do not use too small wire sizes in order not top trigger wire break message. see page 286 of module data.
"CMV" is the Common Mode Voltage which isThe voltage common to all terminals of a group, measured between this group and anyreference point (usually ground potential.) You should keep CMV within permissible limits. if not you will have a diagnostic message of Common mode error The cause of this message is:Potential difference CMV between inputs M andthe reference potential of measuring circuit(MANA out of limits). To remedy:Connect M- with MANA Hope this helps.
|
|
Ayman Elotaify |
|
This contribution was helpful to
|
|
| 3/19/2012 9:34 AM | |
|
Joined: 5/6/2008 Last visit: 8/1/2024 Posts: 57 Rating:
|
Dear Ayman Elotaify:
The second question is about the technical data of SM332-5FH00-0AB0,it is AO module.If the CMV>1V,can i connect S- and Mana? Thanks! |
| 3/19/2012 11:47 AM | |
|
Joined: 5/28/2008 Last visit: 9/9/2024 Posts: 4515 Rating:
|
Hello, What do you mean by S-? Please check that M & Mana as per attached picture So you may need to connect pins 6 , 10 , 14 , 18 , 26 , 30 , 34 , 38 together with Pin 20 Hope this helps.
|
|
Ayman Elotaify |
|
Follow us on