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Insert No.

DLCD-B

Drawing No. LP0535

Released 3/02

Tel +1 (717) 767-6511

Fax +1 (717) 764-0839

www.redlion-controls.com

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.

ORDERING INFORMATION

MODEL NO.

DESCRIPTION

PART NUMBER

Dual Loop Controller w/ DH-485

DLCD

CBJ

Dual Loop Controller w/ 2 Analog

Outputs w/ DH-485

SLC 500 (RJ45) to RJ11 Cable

RJ11 Connector to Terminal Adapter

DLCD0001

DLCD1001

CBJ11C07

DRRJ11T6

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.

DRRJ11

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

When using the Integer File tables in the following sections, refer to the

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 5

Table 8

Table 9

Table 10

Table 13

Table 1 - Overview of Integer File Structure

Control Block

The Control block contains control values and commands, such as Set Point

and Control Mode. The DLCD continually reads the Control Blocks for each

PID loop from the PLC providing a means whereby the PLC program can

control the DLCD.

BIT POSITION

Status Block

The Status block contains current operating values and status such as Process

Value and Input Status. The DLCD continually writes the Status Block for each

PID channel providing a means whereby the PLC can monitor the operating

status of the DLCD.

BIT POSITION

Nx:

15 14 13 12 11 10 9

REFERENCE/

MODBUS REGISTER

Nx:

15 14 13 12 11 10 9

REFERENCE/

MODBUS REGISTER

0 Setpoint Channel A

1 Output Power Channel A

2 15 14 13

4 Setpoint Channel B

5 Output Power Channel B

6 15 14 13

6..5

40002

40005

1 0 Table 3

3 2 1 0 Table 4

40018

40021

1 0 Table 3

3 2 1 0 Table 4

8 Process Value Channel A

9 Output Power Channel A

11 15

12 Process Value Channel B

13 Output Power Channel B

15 15

15..8

7..5

7 6

15..8

7..5

7 6

40001

40005

4 3 2 1 0 Table 6

3 2 1 0 Table 7

40017

40021

4 3 2 1 0 Table 6

3 2 1 0 Table 7

Table 2 - Control Block - Channel A and B

Table 5 - Status Block - Channel A and B

MODBUS REGISTER

BITS

CH. A

CH. B

BITS

MODBUS REGISTER

CH. A

CH. B

6..5

Control Mode

Disable Integral Action

Disable Setpoint Ramping

Not Used

Auto-tune Request (See Note 2)

Auto-tune Code

Not Used

Alarm Output AL2 (See Note 1)

Alarm Output AL1 (See Note 1)

40041

40044

40042

40013

40016

40015

40049

40052

40050

40029

40032

40031

15..8

7..5

Input Error Status Register

Auto-Tune Phase

Control Output OP2

Control Output OP1

Set Point Ramping In Progress

Alarm Output AL2

Alarm Output AL1

40504

40012

40016

40014

40043

40016

40015

40504

40028

40032

40030

40051

40032

40031

Table 6 - Status Block for Nx:10 and Nx:14 Flags

MODBUS REGISTER

BITS

CH. A

CH. B

Bus Active (See Note 5)

Not Used

Auto-Tune In Progress (See Note 4)

Auto-Tune Done (See Note 4)

Not Used

Parameter Block Read Acknowledge

(See Note 6)

Configuration Block Read Acknowledge

(See Note 6)

Parameter Block Write Acknowledge

(See Note 6)

Configuration Block Write Acknowledge

(See Note 6)

Table 3 - Control Block for Nx:2 and Nx:6 Flags

MODBUS REGISTER

BITS

CH. A

CH. B

Not Used

Parameter Read Strobe (See Note 3)

Configuration Read Strobe (See Note 3)

Parameter Write Strobe (See Note 3)

Configuration Write Strobe (See Note 3)

Table 7 - Status Block for Nx:11 and Nx:15 Flags

Table 4 - Control Block for Nx:3 and Nx:7 Flags

Notes:

1. Alarm Output Control

The Control flags Alarm Output AL1 and AL2 must set TRUE (1) for correct

Alarm operation when Control Mode is Automatic (0). Set to 0 to reset an

Alarm.

2. Auto-tune Request

Setting the Auto-tune Request flag forces the DLCD to start the auto-tune

process. Refer to section Auto-tune Request for more detail on how the PLC

program may auto-tune a PID loop in the DLCD.

3. Read/Write Strobes

Setting the Read/Write Strobe flags forces the DLCD to upload or download

the appropriate Parameter or Configuration block. Refer to section

Transferring Parameter and Configuration Data for more detail on how to

transfer these blocks between the PLC and the DLCD.

4. Auto-tune Status

Monitoring the Auto-Tune Done and Auto-Tune In Progress flags allows the

PLC program to detect the completion of the Auto-tune process in the DLCD.

Refer to section Auto-tune Request for more detail on how the PLC program

may auto-tune a PID loop in the DLCD.

5. Bus Active

Each DLCD toggles the Bus Active flag on each communication scan.

6. Read/Write Acknowledge

The DLCD sets the appropriate acknowledge flag once the requested upload

or download of the Parameter or Configuration block is complete. Refer to

section Transferring Parameter and Configuration Data for more detail on

how to transfer these blocks between the PLC and the DLCD.

7. Data flow is described with respect to the DLCD in exchanges with the PLC.

Thus, Read data is data transferred from the PLC to the DLCD and Write

data is data transferred from the DLCD to the PLC.

Parameter Block

The Parameter blocks contain values that may need to be changed while the

DLCD is operating, such as PID parameters. Each Parameter Block may be

uploaded to or downloaded from the PLC on demand by setting the appropriate

request bit in the Control Block. Refer to section Transferring Parameter and

Configuration Data to see how this is done.

BIT POSITION

Nx:

15 14 13 12 11 10 9

BIT POSITION

Nx:

15 14 13 12 11 10 9

REFERENCE/

MODBUS REGISTER

REFERENCE/

MODBUS REGISTER

16 Proportional Band

17 Integral Time

18 Derivative Time

19 Cycle Time (Cooling)

20 Deadband (Cooling)

21 Alarm 1 Value

22 Alarm 2 Value

Not Used

Relative Gain (Cooling)

40007

40008

40009

40141

40143

40003

40004

40142

24 Proportional Band

25 Integral Time

26 Derivative Time

27 Cycle Time (Cooling)

28 Deadband (Cooling)

29 Alarm 1 Value

30 Alarm 2 Value

Not Used

Relative Gain (Cooling)

40023

40024

40025

40241

40243

40019

40020

40242

Table 8 - Parameter Block – Channel A

Table 9 - Parameter Block – Channel B

Configuration Block

The Configuration blocks contain values that describe the DLCD setup such

as Input configuration and as such will not need to be changed during normal

operation. These blocks may be uploaded to and downloaded from the PLC on

demand by setting the appropriate request bit in the Control Block. Refer to

section Transferring Parameter and Configuration Data to see how this is done.

BIT POSITION

Nx:

15 14 13 12 11 10

REFERENCE/

MODBUS

BIT POSITION

Nx:

15 14 13 12 11 10

REFERENCE/

MODBUS

32 Offset Power

33 Span Correction

34 Offset Correction

35 Low Limit (Setpoint)

36 High Limit (Setpoint)

37 Ramp Rate (Setpoint)

38 Process Low (Scaling Points)

39 Process High (Scaling Points)

40 Input Low (Scaling Points)

41 Input High (Scaling Points)

42 Cycle Time (OP1)

43 On Delay (AL1)

44 On Delay (AL2)

45 Scaling Value Low (Analog Output)

46 Scaling Value High (Analog Output)

47 Direct Entry Value (Analog Output)

48 Ramping Setpoint Value

49 15

14..8

50 Sensor Failure Power Preset (OP1)

51 Power Low Limit (OP1)

52 Power High Limit (OP1)

53 Dampening Time (OP1)

54 Hysteresis (AL1)

56 15 14 13 12

57 15..14 13..11

58 15

59 Action (AL1)

Not Used

11..8

Hysteresis (AL2)

14..0

Action (AL2)

4..0

40010

40106

40107

40108

40109

40110

40111

40112

40113

40114

40116

40135

40140

40303

40304

40307

40045

Table 11

40120

40118

40119

On/Off Control Hysteresis (OP1) 40121 40122

40134 40139

40305 40306

Table 12

Table 14

Table 15

40131 40136

64 Offset Power

65 Span Correction / Remote Setpoint Ratio Multiplier

66 Offset Correction / Remote Setpoint Bias Offset

67 Low Limit (Setpoint)

68 High Limit (Setpoint)

69 Ramp Rate (Setpoint)

70 Process Low (Scaling Points)

71 Process High (Scaling Points)

72 Input Low (Scaling Points)

73 Input High (Scaling Points)

74 Cycle Time (OP1)

75 On Delay (AL1)

76 On Delay (AL2)

77 Scaling Value Low (Analog Output)

78 Scaling Value High (Analog Output)

79 Direct Entry Value (Analog Output)

80 Ramping Setpoint Value

81 15

14..8

82 Sensor Failure Power Preset (OP1)

83 Power Low Limit (OP1)

84 Power High Limit (OP1)

85 Dampening Time (OP1)

86 Hysteresis (AL1)

88 15 14 13 12

89 15..14

90 15

91 Action (AL1)

Not Used

13..11

14..0

Action (AL2)

11..8

Hysteresis (AL2)

10..0

4..0

40026

40206

40207

40208

40209

40210

40211

40212

40213

40214

40216

40235

40240

40311

40312

40315

40053

Table 11

40220

40218

40219

On/Off Control Hysteresis (OP1) 40221 40222

40234 40239

40313 40314

Table 12

Table 14

Table 15

40231 40236

55 Deadband (Analog Output) Update Time (Analog Output)

10..0

87 Deadband (Analog Output) Update Time (Analog Output)

Table 10 - Configuration Block – Channel A

Table 13 - Configuration Block – Channel B

MODBUS REGISTER

BITS

CH. A

CH. B

BITS

MODBUS REGISTER

CH. A

CH. B

Remote/Local Setpoint Select

Channel B Assignment (Input)

40046

40104

40198

40204

15..14 Local/Remote Set Point Transfer Mode (Input)

13..11 Mode (Analog Output)

10..0 Assignment (Analog Output)

40302

40301

40199

40310

40309

14..8 Rounding (Input)

Table 11 - Configuration Block for Nx:49 and Nx:81 Flags

Table 14 - Configuration Block for Nx:57 and Nx:89 Flags

MODBUS REGISTER

BITS

Ch. A

Ch. B

MODBUS REGISTER

BITS

CH. A

CH. B

15 Reset (AL2)

14 Reset (AL1)

13 Enable Standby (AL2)

12 Enable Standby (AL1)

11..8 Digital Input Filter (Input)

7 Temperature Scale (Input)

6 Control Action (OP1)

5 Filter (Analog Output)

4..0 Process Decimal Point (Scaling Points)

40137

40132

40138

40133

40105

40102

40117

40308

40115

40237

40232

40238

40233

40205

40202

40217

40316

40215

15 Resolution (Input)

14..0 Input Type (Input)

40103

40101

40203

40201

Table 15 - Configuration Block for Nx:58 and Nx:90 Flags

Table 12 - Configuration Block for Nx:56 and Nx:88 Flags

2.0 Setting the DIP Switches

Overview

The DIP Switches and the Default Serial Terminal set the DLCD serial

communication operating mode to either DH-485 mode or MODBUS mode.

DH-485 mode allows the DLCD to be connected to a DH-485 network.

MODBUS mode allows programming of the DLCD using RLCPro.

PLC Address

The DLCD transfers data with a target PLC. Switch B (SWB) allows the

address of the target PLC on the DH-485 network to be set in the range 0..7.

PLC

ADDRESS

SWITCH POSITION

DH-485 Mode

Integer File

Each DLCD is assigned a unique Integer File in the PLC that the DLCD uses

to transfer data. Switch A (SWA) sets the target Integer file in the range

N7..N70.

Note N8 and N9 are invalid Integer File numbers and therefore cannot be used.

INTEGER

FILE

SWITCH POSITION

COMMENT

N10

N11

N70

Valid File Number

Invalid File Number

Valid File Number

Table 18 - Selections for PLC Address using DIP Switch B

Example 1

This example shows the DIP Switch settings for a DLCD operating in DH-

485 mode with the following configuration.

PLC Address

DLCD Address

Integer File

: 10 (N10)

Valid File Number

Table 16 - Integer File settings using DIP Switch A

DLCD Address

Each device on a DH-485 network must have a unique address. Switch B

(SWB) allows the DLCD address to be set in the range 0..31.

DLCD

Address

Switch Position

UP UP

DN DN DN DN

DN DN DN DN DN

Communication Settings

The DLCD has a fixed baud rate of 19200 when used in DH-485 mode.

Table 17 - Selections for DLCD Address using DIP Switch B

MODBUS Mode

In MODBUS mode, the DLCD responds to MODBUS RTU frames and

therefore allows programming using RLCPro (refer to DLC Bulletin for

detailed information on using RLCPro with the DLCD). To configure the

DLCD for MODBUS without changing the DIP switches, use the Default Serial

Setting Terminal.

Alternatively, set all DIP switches Down as shown in Example 2. The DLCD

leaves the factory in this state, and is therefore ready to be programmed using

RLCPro.

Example 2

This example shows the DIP Switch settings for a DLCD operating in

MODBUS mode with the default serial settings.

DEFAULT SERIAL SETTING CONNECTIONS

If using software selectable serial

settings and the serial settings are unknown

or forgotten, they can be temporarily reset

to the defaults by connecting the “Default

Serial Setting” terminal 7 to “Output

Common” terminal 4 with a jumper.

Serial Communication Defaults:

Protocol:

RTU

Address:

247

Baud Rate:

9600

Data Bits:

Parity:

none

DN DN DN DN DN DN

DN DN DN DN DN DN DN DN