Pilz 20 748-03 User manual

Programmable Safety Systems
PSS-Range
PSS SB ACTIVE JUNCTION BASIS
Operating Manual
Item No. 20 748-03

2 Operating Manual: PSS SB ACTIVE JUNCTION BASIS
Contents
Function description 3
Intended use 5
Safety 6
EMCD 6
ESD 6
Warranty and liability 6
Safety guidelines 6
Disposal 6
Bus structure with PSS SB ACTIVE JUNCTION BASIS 7
Rules for incorporation 7
Rules for bus termination 7
Determining the bus cable runs and transmission rate 8
SafetyBUS p interfaces 9
SafetyBUS p main branch 9
SafetyBUS p sub branches 9
Installation 10
Supply voltage 11
Insulation voltage test 11
Connection 12
Connecting the supply voltage 12
Earthing 12
Main branch 12
Sub branches 12
Display elements 14
Faults 14
Technical details 15

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Operating Manual: PSS SB ACTIVE JUNCTION BASIS
Function description
The PSS SB ACTIVE JUNCTION BASIS is a component part of the Pilz Active
Junction. An Active Junction consists of a base unit (PSS SB ACTIVE
JUNCTION BASIS) and up to two expansion modules (PSS SB ACTIVE
JUNCTION EXPANSION).
An Active Junction operates as an active junction with repeater function and is
designed for use in SafetyBUS p networks. It galvanically isolates up to 6 sub
branches from the SafetyBUS p main branch. The Active Junction can be used to
connect physically remote field devices to the SafetyBUS p main branch. The
field devices may be in either an IP20 or IP67 environment.
Fig. 1: Elements on the PSS SB ACTIVE JUNCTION BASIS (front view)
If the field devices are in an IP67 environment, the supply voltage for the field
devices can be provided via the Active Junction. In this case, special bus cable
will be required. This is designed for an IP67 environment and contains the lines
for the supply voltage for the field devices as well as the data lines. The
maximum extension of a sub branch is limited by a number of different factors
(number of bus subscribers in the sub branch, transmission rate, current
consumption of the connected field devices etc.).
The base unit PSS SB ACTIVE JUNCTION BASIS is designed for the formation
of two sub branches. If more than two sub branches are required, the expansion
module PSS SB ACTIVE JUNCTION EXPANSION can be used. It is possible to
connect a max. of two expansion modules. Each expansion module can be used
to connect two additional sub branches via the base unit to the SafetyBUS p main
branch.
Power
Traffic
Supply
Traffic
Supply
Sub-Br.Sub-Br.
1
2
ACTIVE JUNCTI N
CAN_L GND CAN_H VCC
1... ...4
-X1-
-X2- 1... ...4
-X3-
-X4-
SHIELD
1... ...4
-X5-
Note:
1... ...4
-X0-
24V 0V
BASIS
6
7
8
4
3
2
1
5
5
1: Supply voltage terminal
2: Display elements sub
branch 1
3: Display elements sub
branch 2
4: SafetyBUS p interfaces
(sub branches)
5: Element for attaching an
expansion module
6: Functional earth
connection
7: SafetyBUS p interface
(main branch)
8: Terminals for connecting
the cable screening

4 Operating Manual: PSS SB ACTIVE JUNCTION BASIS
I/ D
I/ D
MD
LD
PSS SB ACTIVE JUNCTI N BASIS
main branch
sub branch (2)sub branch (1)
IP20
or
IP67
drop line
IP20
1 1
2
3
3 3
4 4 4
5
1 Terminating resistor in
the main branch
(terminator)
2 Terminating resistor for
each sub branch of the
Active Junction
(integrated into the unit)
3 Field devices
4 T-connectors
5 Terminating resistor for
the sub branch
(terminator)
Fig. 2: Bus structure with PSS SB ACTIVE JUNCTION BASIS (principle)
The Active Junction is one of the non-safety-related devices on SafetyBUS p. It
is not assigned a Device Address. Although the Active Junction is not registered
as a bus subscriber, it must be regarded as a bus subscriber when establishing
the transmission rate.
If there is a short circuit in the supply voltage to a sub branch near to the Active
Junction (up to ca. 10 m cable runs), the supply voltage to the sub branch will be
switched off. The “Supply” LED for the relevant sub branch will turn red (see
sections entitled “Display elements” and “Faults”).
If a signal error occurs within a sub branch (permanent dominant signal level),
the sub branch will be ignored. The “Traffic” LED for the relevant sub branch will
turn red (see sections entitled “Display elements” and “Faults”).

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Operating Manual: PSS SB ACTIVE JUNCTION BASIS
Intended use
The PSS SB ACTIVE JUNCTION BASIS is designed for use in SafetyBUS p
networks. It is suitable for connecting physically remote field devices (e.g. light
guards) to the SafetyBUS p main branch. Using the unit allows you to build a star
or tree structure, rather than the linear topology specified for SafetyBUS p.
If the field devices are in an IP67 environment, suitable cable and connection
materials must be used. The information in the guideline: “SafetyBUS p - IP67
Physical Layer Concept”, published by the SafetyBUS p Club International e.V.,
is binding.
Precise details on the PSS SB ACTIVE JUNCTION BASIS are provided in the
“Technical details” section. Use of the device outside the specifications given
here will be deemed as improper use. Any component, technical or electrical
modifications will be deemed as improper use.
Use of the PSS SB ACTIVE JUNCTION BASIS outside the areas described in
this manual will be deemed as improper use. Intended use includes following the
information in this documentation.
NOTICE
SafetyBUS p subscribers in the following table only support the PSS SB ACTIVE
JUNCTION BASIS from the stated version number onwards:
Table 1
From version
3.0
2.0
2.0
2.0
1.7
2.0
2.0
SafetyBus p module
PSS SB CPU
PSS SB 3006 CN-A
PSS SB 3006 DP-S
PSS SB 3006 IBS-S
PSS SB DI8O8
PSS SB DI16
PSS SB Router1

6 Operating Manual: PSS SB ACTIVE JUNCTION BASIS
Safety
The PSS SB ACTIVE JUNCTION BASIS is not a safety-related device.
EMCD
The device is designed for use in an industrial environment. Interference may
occur if used within a domestic environment.
ESD
CAUTION!
Electrostatic discharge can damage components on the device. Ensure against
discharge before touching the device, e.g. by touching an earthed, conductive
surface or by wearing an earthed armband.
Warranty and liability
All claims to warranty and liability will be rendered invalid if:
• The system was used contrary to the purpose for which it is intended
• Damage can be attributed to not having followed the guidelines in the
documentation
• Operating personnel are not suitably qualified.
• The housing was opened
• Any type of modification has been made (e.g. exchanging components on the
PCB boards, soldering work etc.)
Safety guidelines
The information and requirements stipulated in the “SafetyBUS p Installation
Manual” are valid when using the PSS SB ACTIVE JUNCTION BASIS (see
SafetyBUS p System Manual). Failure to comply with these stipulations will
render all warranty and liability claims invalid.
The guidelines in the “SafetyBUS p - IP67 Physical Layer Concept” of the
SafetyBUS p Club International e. V. must also be met.
Disposal
The device must be disposed of properly when it reaches the end of its service
life.

7
Operating Manual: PSS SB ACTIVE JUNCTION BASIS
Bus structure with PSS SB ACTIVE JUNCTION BASIS
Rules for incorporation
The Active Junction (base unit and expansion module) is transparent for all
telegrams on the main branch and sub branches. If a signal error occurs within a
sub branch (permanent dominant signal level), the sub branch will be ignored.
Please note the following rules:
• The physical arrangement of the Active Junction on the main branch can be
freely selected. However, bear in mind that run time delays on the signals must
be considered when using an Active Junction. These run time delays can be
expressed as constant virtual cable runs (see section entitled “Determining the
bus cable runs and transmission rate”).
• Using the Active Junction allows you to build a star or tree structure, rather than
the linear topology specified for SafetyBUS p. This reduces the effective
electrical cable runs (no return line needed).
• The relationship of the cable runs to the transmission rate should be
maintained.
• Where possible, plan to use only complete I/O-Groups in a sub branch. This
increases the availability if an error occurs.
Rules for bus termination
Each branch (main branch and sub branches) must be fitted with terminating
resistors.
• The signal lines (CAN_L and CAN_H) on the first and last bus subscribers on
the main branch should be fitted with terminating resistors (120 Ohm).
• The Active Junction is the first bus subscriber on a sub branch. The device has
an integral terminating resistor for each sub branch. The signal lines (CAN_L
and CAN_H) on the last bus subscriber on each sub branch should therefore
be fitted with a terminating resistor (120 Ohm). If necessary use special IP67
terminators.

8 Operating Manual: PSS SB ACTIVE JUNCTION BASIS
Determining the bus cable runs and transmission rate
NOTICE
Please read the information in chapter "Designing a SafetyBUS p network" of the
"SafetyBUS p Installation Manual".
If you are using Active Junction please also note:
• Examine every connection combination between the first and last bus
subscriber across all branches (see Fig. 3)
• If the line under examination contains Active Junctions, account for them with
the virtual cable runs as shown in Table 2:
Number of
Active Junctions
1
2
Virtual cable runs
(total)
50 m
100 m
90 m
Cable runs lDistance
between
adjacent Active Junctions
in the main branch
---
lDistance < 10 m
lDistance ≥10 m
MD
LD
I/ D
I/ D
I/ D I/ D
main line
l
Distance
Active Junctions
I/ D I/ D
main branch
l
Distance
l
Distance
Fig. 3: Active Junction arrangement (example)
Table 2
INFORMATION
If possible place all Active Junctions on the main branch (see Fig. 4). This will
guarantee that a maximum of 2 Active Junctions with virtual cable runs will impact
on the main line.

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Operating Manual: PSS SB ACTIVE JUNCTION BASIS
SafetyBUS p interfaces
SafetyBUS p main branch
Connection to the SafetyBUS p main branch is via a male 9-pin D-Sub connector.
Fig. 4: Configuration of the interface to the SafetyBUS p main branch
SafetyBUS p sub branches
Connection to the SafetyBUS p sub branches is via 4-pin screw connectors.
1: n.c.
2: CAN_L (brown)
3: CAN_GND (white)
4: n.c.
5: CAN_SHLD
6: n.c.
7: CAN_H (green)
8: Supply voltage for fibre-optic couplers
from Pilz
9: n.c.
n.c. = not connected
1
95
6
Male 9-pin D-Sub connector
9-pin
1234
X1
1234
X2
Fig. 5: Configuration of the interface to the SafetyBUS p sub branches
4-pin screw connectors
(X1/X2)
1: CAN_L (brown)
2: GND (white)
(CAN_GND and VCC_GND)
3: CAN_H (green)
4: VCC (red)
(carried supply voltage 24 V)

10 Operating Manual: PSS SB ACTIVE JUNCTION BASIS
75 (2.95")
94 (3.70")
121 (4.76")
45
(1.77")
87 (3.42") 49,2
(1.94")
5
(0.196")
Installation
INFORMATION
Please refer also to the chapter entitled “Installation and Assembly” in the
“SafetyBUS p Installation Manual”.
The PSS SB ACTIVE JUNCTION BASIS is enclosed in a 45 mm P99 housing,
suitable for DIN rail mounting.
• The device should be installed in a control cabinet with a protection type of at
least IP54.
• There are two notches on the back of the unit for DIN rail attachment.
• If you are installing the unit on to a vertical DIN rail, ensure that it is mounted
securely by using a retaining bracket or an end angle.
Fig. 6: Dimensions