Figure 2-10 Discrete Output Connections - Honeywell VPR100 User Manual

Discrete Output Connections
The instrument has the following discrete output types.
•
Mechanical relay
•
Solid state AC/DC
•
Open collector
Make connections according to Figure 2-10.
See Table 1-1 Specifications for output signal specifications (switch characteristics) for output circuit card
modules.
The solid state relay switches are each optically isolated and also fully isolated from all other outputs. For
common power, interconnect all module commons (see Figure 2-10C). Power to all modules is supplied by
the user.
The relay will provide protection by removing power to the outputs whenever system power is lost.
ATTENTION
In exceptional cases where the device connected to a relay contact requires a very low nominal energizing
current, it is possible that the current through the snubber network capacitor(s) (located on the circuit card and
used to protect relay contacts from arcing (when the relay contacts are open)) will be sufficient to continue to
energize the relay. To prevent this unwanted energizing, install a load resistor in parallel with the device.
ATTENTION
The solid state relays have minimum output current requirements. See solid state relay specifications in Table
1-1. If these requirements are not met, the discrete output may not turn on.
DO1/2 C
DO1 NC
DO1 NO
Mechanical Relay (Normally Closed)
A
DO1/2 C
DO1 NC
DO1 NO
Solid State AC/DC
C
Note: Figure 2-10 shows example wiring for DO1 and should be used for any Discrete Output.
12/00
-
- Load
L2-
+
-
- Load L2-
+

Figure 2-10 Discrete Output Connections

VPR & VRX – User Manual
DO1/2 C
- Load
DO1 NC
DO1 NO
Mechanical Relay (Normally Open)
B
External power
supply
COMM -
5-30VDC
(any comm
terminal)
100mA max
DO1
Open collector
D
Installation
-
L2-
+
+
Relay
27