OPERATING MANUAL HPC & UMC4
Page 39 of 105
12.5.2 The output signals
The output signals of the UMC4 are available in various Ex protection classes. The terminal designa-
tions vary depending on the protection class ordered.
The terminal designation and their protection class can be taken from the following table:
Designation
Terminal designation
Type of protection
Standard
Signal outputs
Ex ia
(Ex d)
non-Ex ia
(Non-Ex)
Current 1, 4 to 20mA with
HART
®
11 and 12
x
x
41 and 42
x
Current 2, 4 to 20mA
13 and 14
x
x
43 and 44
x
Binary output 1
(passive pulse)
16 and 17
x
x
46 and 47
x
Binary output 2 (status or 2nd
passive pulse output)
19 and 20
x
x
49 and 50
x
Option
Binary output 3
33 and 34
x
x
53 and 54
x
Output Signals in Ex-ia type of protection
12.5.3 HART
®
A number of options are available for HART
®
communication. However, for all these options loop re-
sistance must be less than the maximum load specified in Section 9.3 Load (on page 30). The HART
®
interface is connected via terminal 11 and 12 or 41 and 42 with a minimum load impedance of 250
Ω.
For information regarding operation of the transmitter using the HART
hand-
held terminal, see “Op-
eration of the UMC4 transmitter using the HART
hand-
held terminal.”
12.5.4 Communication via Siemens PDM
®
PDM
®
is the configuration software of Siemens that is used to operate HART
®
or Profibus PA compat-
ible devices.
To connect a desktop or laptop computer to the UMC4, a HART
®
interface is required in addition to
communication software such as PDM. The HART
®
interface, which has two connections, converts the
levels of the RS 232 interface or USB interface into an FSK signal (frequency-shift keying).
