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<2. Preparation>
2-3
IM 12A01A02-72E
3rd Edition : Oct. 01, 2015-00
2.2
Shielding and grounding
Grounding and shielding of the transmitter is necessary for a safe and reliable operation. Please
use one of the following schemes (A or B) as these will give proper shielding and grounding. One
should pay special attention to instruments that required an external power supply (besides the 9
to 32 V supplied by the bus).
Power
unit
Trunk cable
Spur
Spur
FLXA21
Field
device
Junction
box
V
1
V
3
V
2
V
4
V
1 =
V
2 =
V
3 =
V
4
Potential equalisation line (German practice)
Power
unit
Trunk cable
Spur
Spur
FLXA21
Field
device
Junction
box
High integrity earth, 0.1R or better
Neutral star-point bonding (English practice)
A
B
Figure 2.2
Shield and grounding
2.3
How to download EDD for PDM
It takes a certain time to insert EDD to PDM package. If your PDM package doesn’t include
FLXA21 EDD, download it from the following website.
http://www.yokogawa.com/an/download/an-dl-profibus-001en.htm
*: This address is subject to change without prior notice. If the above address cannot be
accessed, consult your nearest sales office or the agency from which you purchased the
product.