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Doc # E107706 V1.25 9-11
9.7:
Digital
Dry
Contact
Relay
Output
(Form
C)
Module
Digital Dry Contact Relay Output (Form C) Module Specifications
Model Number
Communication
Power Requirement
Operating Temperature
Maximum Load Impedance
4RO1: 4 Latching Relay Outputs
RS-485, Modbus RTU
Programmable Baud Rates: 4800, 9600, 19200, 57600
15–20V
dc
at 50–200 mA;
Nexus 1250/1252 Unit
supports up to 4 Modules
(-20 to 79)°C / (-4 to +158)°F
0-1mA: 10k Ω; 4-20mA: 500 Ω
Factory Settings
Modbus Address: 156
Baud Rate: 57600
Default Settings
(Reset Button)
Modbus Address: 247
Baud Rate: 57600
9.7.1:
Overview
Q
The Relay Output Module consists of four Latching Relay Outputs. In Normal Mode, the device
accepts commands to control the relays. Relay output modules are triggered by limits programmed
with the Communicator EXT software. See the Communicator EXT User Manual for details on
programming limits.
Q
Nexus 1250/1252 Unit supplies power for up to 4 connected Relay Output modules. See section 9.2
for power and communication details. Refer to sections 5.12 - 5.13 to determine if you must use an
additonal power source, such as the EIG PSIO.
Q
The Modbus Map for the Analog Output Module (and operating details) can be found in the Modbus
Communicating I/O Modules Manual.
Q
Each latching relay will hold its state in the event of a power loss.
Transmit Delay Time: 0
Transmit Delay Time: 20 csec
Programmable
Accuracy
Scaling
0.1% of Full Scale