Wiring RMS621
20 Endress+Hauser
!
Note!
The current/PFM/pulse inputs or the RTD inputs in the same slot are not galvanically isolated.
There is a separation voltage of 500 V between the aforementioned inputs and outputs in various
slots. Terminals with the same second digit are jumpered internally. (Terminals 111 and 181)
4.2.5 Connecting remote display/operating unit
Functional description
The remote display is an innovative addition to the powerful RMX 621 top-hat rail devices. The user
has the opportunity to optimally install the arithmetic unit to suit the installation and mount the
display and operating unit in a user-friendly way at easily accessible locations. The display can be
connected to both a top-hat rail device without, as well as a top-hat rail device with, an installed
display/operating unit. A 4-pin cable is supplied to connect the remote display with the basic unit;
other components are not necessary.
!
Note!
Only one display/operating element can be attached to a top-hat rail device and vice versa (point-
to-point).
121 + RTD power supply 2 B, C, D top, rear (B II, C
II, D II)
RTD input 2
120 + RTD sensor 2
119 - RTD sensor 2
118 - RTD power supply 2
142 Relay 1 Common (COM) B, C, D bottom, front (B
III, C III, D III)
Relay 1
143 Relay 1 normally open (NO)
152 Relay 2 Common (COM) Relay 2
153 Relay 2 normally open (NO)
131 + 0/4 to 20 mA/pulse output 1 B, C, D bottom, centre (B
IV, C IV, D IV)
Current/pulse output 1 active
132 - 0/4 to 20 mA/pulse output 1
133 + 0/4 to 20 mA/pulse output 2 Current/pulse output 2 active
134 - 0/4 to 20 mA/pulse output 2
135 + pulse output 3 (open collector) B, C, D bottom, rear (B V,
C V, D V)
Passive pulse output
136 - pulse output 3
137 + pulse output 4 (open collector) Passive pulse output
138 - pulse output 4
Terminal (item no..) Terminal assignment Slot Input and output
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