RS485 Modbus communications - PENN Controls - LIT-12011458 - C450Cxx - C450Rxx - C450Sxx - C450Yxx - System 450 Multi-Purpose Modular Control System - C450CBN Standard Control Module One Relay Output - C450CCN Standard Control Module Two Relay Outputs - C450CEN Communications Control Module for Ethernet - C450CPN Standard Control Module One Analog Output - C450CPW-400 Hybrid Control Module for EC Motor - C450CQN Standard Control Module Two Analog Outputs - C450CRN Communications Control Module for Modbus - C450RBN Reset Control Module One Relay Output - C450RCN Reset Control Module Two Relay Outputs - C450SBG Expansion Module One Low-Voltage Relay Output - C450SBN Expansion Module One Relay Output - C450SCG Expansion Module Two Low-Voltage Relay Outputs - C450SCN Expansion Module Two Relay Outputs - C450SPN Expansion Module One Analog Output - C450SQN Expansion Module Two Analog Outputs - C450YNN‐1 Power Module

System 450 Series Modular Controls Product Bulletin
Product
Controls > Multi-Purpose Modular Controls > C450CBN Standard Control Module One Relay Output
Controls > Multi-Purpose Modular Controls > C450CQN Standard Control Module Two Analog Outputs
Controls > Multi-Purpose Modular Controls > C450SPN Expansion Module One Analog Output
Controls > Multi-Purpose Modular Controls > C450CRN Communications Control Module for Modbus
Controls > Multi-Purpose Modular Controls > C450CPW-400 Hybrid Control Module for EC Motor
Controls > Multi-Purpose Modular Controls > C450CPN Standard Control Module One Analog Output
Controls > Multi-Purpose Modular Controls > C450SCN Expansion Module Two Relay Outputs
Controls > Multi-Purpose Modular Controls > C450SBG Expansion Module One Low-Voltage Relay Output
Controls > Multi-Purpose Modular Controls > C450SQN Expansion Module Two Analog Outputs
Controls > Multi-Purpose Modular Controls > C450SCG Expansion Module Two Low-Voltage Relay Outputs
Controls > Multi-Purpose Modular Controls > C450RBN Reset Control Module One Relay Output
Controls > Multi-Purpose Modular Controls > C450SBN Expansion Module One Relay Output
Controls > Multi-Purpose Modular Controls > C450CCN Standard Control Module Two Relay Outputs
Controls > Multi-Purpose Modular Controls > C450CEN Communications Control Module for Ethernet
Controls > Multi-Purpose Modular Controls > C450RCN Reset Control Module Two Relay Outputs
Document type
Product Bulletin
Document number
LIT-12011458
Revision date
2021-07-21

The System 450 control module with Modbus communications is an RS485, RTU compliant Modbus subordinate device. You can use it to connect your System 450 control system to Modbus networks and communicate over them.

The System 450 Modbus communication control module also enables your entire control system to respond to data requests and commands from a Modbus master device on the Modbus network.

Table 1. System 450 Control Module capabilities
Control by ________ System 450 Control Modules
Standard Communications Reset Hybrid
C450CPN-4

C450CQN-4

C450CBN-4

C450CCN-4

 C450CEN-1

C450CRN-1

 C450RBN-3

C450RCN-3

 C450CPW-400
Controlled condition
Temperature X X X X
Pressure X X - X
Humidity X X X X
Combination of conditions X X X X
Control capabilities
On/Off relay control X X X X
Analog proportional control (direct and reverse action) X X X X
Analog proportional plus integral control (direct and reverse action) X X X X
Combination of On/Off relay and analog output control X X X X
Stand-alone control X - X X
Multi-stage control (relay or analog) X X X X
Network communications - X - -
High input signal selection X X - X
Differential control X X - X
Output signal limiting

output signal update rate

Output signal deadband

 X X - -
Binary input control for relay outputs X X - -
On/Off duration time control

Minimum On/Off time

On/Off time delay

 X X - -
Temperature and humidity reset control - - X -
Scheduling and temperature setback control - - X -
Reset setpoint control - - X -
Setback scheduling - - X -
Run-time balancing - - X -
Hybrid analog output control - - - X1
1 Only on output OUTA1.