DLCD0001 Datasheet, PDF (1/8 Pages) Red Lion Controls. Inc – MODEL DLCD – DUAL LOOP CONTROLLER w/ DH-485

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Insert No. DLCD-B
Drawing No. LP0535
Released 3/02
MODEL DLCD – DUAL LOOP CONTROLLER w/ DH-485
GENERAL DESCRIPTION
The Model DLCD, Dual Loop Controller with DH-485, has a similar feature
set and specifications as the standard Dual Loop Controller. The DLCD
provides a connection into an Allen Bradley DH-485 network allowing a fully
featured dual loop PID controller to be controlled and monitored by an Allen
Bradley PLC (SLC 500 controller, or similar), over a DH-485 network.
The DLCD communications port may be configured for DH-485, or as a
programming port allowing complete programming by our Windows^ based
RLCPro configuration software.
USING THIS DOCUMENT
This document is an addendum to the bulletin describing the standard DLC
and describes the use of the DH-485 connection of the DLCD. This document
should be read in conjunction with the DLC Bulletin.
ORDERING INFORMATION
MODEL NO. DESCRIPTION
PART NUMBER
DLCD
Dual Loop Controller w/ DH-485
Dual Loop Controller w/ 2 Analog
Outputs w/ DH-485
DLCD0001
DLCD1001
CBJ SLC 500 (RJ45) to RJ11 Cable
CBJ11C07
DRRJ11 RJ11 Connector to Terminal Adapter DRRJ11T6
1.0 Using the DLCD on a DH-485 Network
Overview
The DLCD rapidly exchanges blocks of control and status information for
each PID loop with an Integer File that has been allocated in the PLC. Each
DLCD is assigned an Integer File by setting the appropriate DIP Switches on
the DLCD. By accessing this Integer File, the PLC is able to control and
monitor the operation of each PID loop within each DLCD. Most applications
will only require information contained in these Control and Status blocks. The
ability has been included to upload and download Parameter and Configuration
blocks on demand for each PID loop.
Integer File Structure
The Integer File for each DLCD is structured to include Control, Status,
Parameter and Configuration blocks for each PID Loop. Control and Status
blocks contain data that is transferred automatically by the DLCD on alternate
communication scans. Parameter Blocks contain DLCD operating parameters
and may be occasionally changed. Configuration Blocks contain system
configuration parameters and are rarely changed.
Table 1 gives the overall structure of the Integer File giving the location of
the various blocks for each PID loop or channel. The tables in the following
sections show the structure of each block and provide a cross-reference from the
Allen Bradley Integer File register to the equivalent MODBUS Holding
Register in the DLCD.
When using the Integer File tables in the following sections, refer to the
Register Table in the DLC Bulletin for register details such as factory setting,
limits and description.
Note: Modbus registers provided for reference only.
Nx:
Block
0..3 Control Block – Channel A
4..7 Control Block – Channel B
8..11 Status Block – Channel A
12..15 Status Block – Channel B
16..23 Parameter Block – Channel A
24..31 Parameter Block – Channel B
32..63 Configuration Block – Channel A
64..95 Configuration Block – Channel B
Reference
Table 2
Table 2
Table 5
Table 5
Table 8
Table 9
Table 10
Table 13
Table 1 - Overview of Integer File Structure
1