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7 Electrical connection
80
External relay
module ER8
Voltage source
for external
2-wire
transmitter
Logic operating
inputs
min. pulse length:
HIGH 400msec
LOW 400msec
Open-collector
outputs
Serial interface
RS 422/RS 485
Communication
with external
relay module
24V / 45mA
± 5%
Contact operation
LOW =
≥ 100kΩ
R
OFF
HIGH =
≤ 50kΩ
R
ON
Voltage operation
LOW =
DC 0 — 5V
(not active)
HIGH =
DC 20 — 35V
(active)
DOUT1 — DOUT4
U
= DC 32V
max
I
= 100mA
max
"On" voltage
DOUT active
U
=
DOUTactive
0.4 — 1.2V
Communication
with higher-
level systems
Field
7.
contact no. 7 =
logic input 1
.
.
.
contact no. 14 =
logic input 8
8.
9.
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