Flowserve MX-100 Field Unit - Manual (Page 6)

MX/DDC-100 Field Unit Installation and Maintenance FCD LMENIM2329-01 – 03/11
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1.4 User Knowledge
It is recommended that the user read this manual in its entirety before the DDC-100 equipped actuator is installed and
operated.
The user needs to have a fundamental knowledge of electronics and microprocessor concepts. An understanding of
valve actuators and digital control systems is beneficial to the field unit user.
1.5 DDC-100 System Capabilities and Features
Limitorque’s distributed digital control (DDC) valve control network supports up to 250 actuators over a single
twisted-pair cable using Modbus™ protocol. MX actuators and other devices can be accessed from a control room
for integration with a plant asset management (PAM) system, distributed control system (DCS), programmable
logic controller (PLC), or personal computer (PC) based network. The DDC-100 system consists of a host system,
controller, network, and field units. A typical DDC-100 system is shown in Figure 1.1.
Figure 1.1 – Typical DDC-100 system with or without a Master Station II
1
2
3 4
5
250
...
Host controller
Optional
Master
Station
Network
RS-485
MX field
units
(up to 250)