Appendix C Specifications TB820 ModuleBus Modem

3BSE020923R5021 235

TB820 ModuleBus Modem

Features

• 2 fiber optic ports to optical ModuleBus.

• ModuleBus (electrical) to the I/O Modules.

• Supervisory functions of I/O ModuleBus

and power supply.

• Isolated power supply to I/O modules.

• DIN rail mounting.

Description

The TB820 ModuleBus Modem is a

communication interface for connection of S800

I/O modules via the optical and electrical

ModuleBus.

The module can not handle High Integrity I/O

modules (AI880, DI880 and DO880).

The TB820 can be used in both a simplex optical

configuration as well as in a duplex optical

configuration. In a simplex configuration, the

optical ModuleBus nodes are connected in a ring.

In a duplex configuration, the optical ModuleBus

nodes are connected in a row.

TB820 has two basic parts: Module termination board and the power

supply/communications board (see block diagram).

The termination board is a unit where most of the connections to the outside takes

place. It is grounded to the DIN rail through a metallic spring connector. The board

carries screw terminals for power supply and redundant power supply monitoring,

connector for the electrical ModuleBus, a current limit “fuse” for the +24 V supply

of the I/O modules and the electrical ModuleBus.

12

75

34 6

CLUSTER

F R

Rx2Rx1

P

TB820 V2

ERx

X4 X5

Rx2Tx2

Rx1Tx1

SBSA

L+L-

Description Appendix C Specifications

236 3BSE020923R5021

The power supply board has an isolated power converter that generates a short

circuit proof +5 V supply for the TB820 and connected I/O modules. This board

also contains the ModuleBus interfaces, LED indicators and one screwdriver

maneuvered rotary switch for the ModuleBus I/O cluster address. The ModuleBus

I/O cluster address (1-7) is set by a rotary decimal code switch, any other value than

1-7 is not allowed and will turn the Run LED off.

The ModuleBus has an electrical and an optical interface which are logically the

same bus. A maximum of twelve I/O modules can be connected to the electrical

ModuleBus and up to seven clusters can be connected to the fiber optic ModuleBus

expansion. The fiber-optical interface is intended for local distribution of I/O

clusters and where more than 12 I/O modules per station are required. Any

distribution of I/O modules across the base cluster and the remote cluster(s) is

allowed, however not more than 24 I/O modules per station can be used.

The module is equipped with optical Transmitter/Receiver for up to 10 Mbit/s. Both

plastic and HCS (Hard Clad Silica) optic fiber with connectors (Agilent’s, former

Hewlett-Packard, Versatile Link) can be used with TB820.

Appendix C Specifications Technical Data

3BSE020923R5021 237

Technical Data

Table 54. TB820 ModuleBus Modem Specifications

Item Value

Power input 24 V d.c. (19.2 - 30)

Power consumption at 24V d.c. 100 mA

Power dissipation 6.0 W

Power supply monitoring inputs Max. input voltage: 30V

Min. input voltage for high level: 15 V

Max. input voltage for low level: 8 V

Power output (ModuleBus) 24 V max. = 1.4 A

5 V max. = 1.5 A

Electrical ModuleBus Maximum of 12 I/O modules

Optical ModuleBus

Fiber optic interface, two transmitters

and two receivers for

Maximum of 7 I/O clusters

Max. 10 Mbit/s

Wavelength 650 nm

Maximum ambient temperature 55oC/(131° F)

Technical Data Appendix C Specifications

238 3BSE020923R5021

Indicators R(un) LED: Green indicates that the TB820

is operational

F(ault) LED: Red indicates a fault condition;

Reset and communications errors on the

electrical ModuleBus turns the LED on.

P(owok) LED: Green indicates that the

d.c./d.c. converter generates a valid

+5 V d.c.

ORx1 and ORx2 traffic LEDs: Yellow

(blinking) indicates that the TB820 is

receiving data on the two optical

ModuleBus channels respectively.

ERx traffic LED: Yellow (blinking) indicates

the TB820 is receiving data on the electrical

ModuleBus.

Equipment Class Class I according to IEC 60536; (earth

protected)

Ingress Protection IP20 according to IEC 60529

Rated insulation voltage 50 V

Dielectric test voltage 500 V a.c.

Acceptable wire sizes Solid: 0.2 - 2.5 mm2

Stranded: 0.2 - 2.5 mm2, 24 - 12 AWG

Recommended torque: 0.5 Nm

Width 58 mm (2.28”)

Depth 122 mm (4.80”)

Height 170 mm (6.69”) including latch

Weight 0.3 kg (0.66 lbs.)

Table 54. TB820 ModuleBus Modem Specifications (Continued)

Item Value

Appendix C Specifications Connections

3BSE020923R5021 239

Connections

Figure 103. TB820 Module

Table 55. Power Supply Connections TB820/TB820V1

Designation Description

L+ +24 V d.c. Supply In

L+ +24 V d.c. Supply Out

SA Redundant Power Supply “A” Monitoring

Input

L- 0 V d.c. Supply In

CLUSTER

B

SA

L-

L+ +

-

F R

ORx2ORx1

P

TB820

12

7

5

34 6

ERx

17

0 m

m (

6.7

”)58 mm (2.3”) 122 mm (4.8”)

SB

LL+

SA

Connections Appendix C Specifications

240 3BSE020923R5021

L- 0 V d.c. Supply Out

SB Redundant Power Supply “B” Monitoring

Input

Table 56. Power Supply Connections TB820V2

Designation Description

L+ +24 V d.c. Supply

L- 0 V d.c. Supply

SA Redundant Power Supply “A” Monitoring

Input

SB Redundant Power Supply “B” Monitoring

Input

Table 55. Power Supply Connections TB820/TB820V1 (Continued)

Designation Description

Appendix C Specifications Opto Cable according to HP

3BSE020923R5021 241

Opto connectors type Agilent’s, former Hewlett-Packard, Versatile Link can handle

both plastic and HCS optic fiber.

Opto Cable according to HP

Plastic Optical Fiber (POF) up to 15 meters.

• Extra low loss attenuation.

• Simplex or duplex cable.

• Latching simplex or duplex connector.

• Cable attenuation maximum 4 dB.

Hard Clad Silica (HCS) fiber up to 200 meters.

• Riser or plenum.

• Simplex or duplex cable.

• Latching simplex or duplex connector.

• Cable attenuation maximum 2 dB.

Table 57. Optical ModuleBus Connections (X4, X5)

Port Duplex Signals Simplex Signals

X4 - Tx Transmit data to down-stream

device

Transmit data to next device

X4 - Rx Receive data from down-

stream device

Not used

X5 - Tx Transmit data to up-stream

device

Not used

X5 - Rx Receive data from up-stream

device

Receive data from last device

Block Diagram TB820 Appendix C Specifications

242 3BSE020923R5021

Block Diagram TB820

DC

DC

POWOK

D+,D-

POS(9:0)

MB+24 V

L-0 V

MB+5 V

SB

SA

L-

L+

P(owok)

R(un)

F(ault)

ORx2

ORx1

X3

X1A

1

2

1

3

3

2

TB820-1

TB820-2

Electrical ModuleBus

Connector

EO

DIN-rail

X1B

CLK+,CLK-

POS(9:7)

EO

EO

EO

X2

ERx

X4 X5

MBI-4Reset logic,

+5 V Supervision

+5 V

MB +5 V MB +5 V

+5 V

0 V 0 VCurrent

Limit

MB +5 V

0 V

0 V

+5 V

RS-485

RS-485