AS-Interface Maintenance and Troubleshooting
FACTORY AUTOMATION
AS-INTERFACE
MAINTENANCE AND
TROUBLESHOOTING GUIDE
Edition 3.0
Table of Contents
As-Interface Basics
As-Interface Basics.................................................................. 3
¢ Use only certified modules, gateways/scanners, and power supplies.
Addressing Modules................................................................ 4
¢ Total segment cable length is 100 m. This includes the total of all
trunk and drop lines.
Handheld Programmer............................................................. 5
Gateway Quick Start................................................................ 6
Gateway Advanced Features.................................................. 7
Exchanging SafetyNodes......................................................... 8
¢ One AS-Interface power supply is required per segment. For
example, a network with two repeaters requires three power supplies.
¢ Exactly one gateway/scanner is required per network.
¢ 31 addresses maximum; extended addressing, 1-31a and 1-31b, is
permitted on 2.1 and 3.0 spec. networks for a total of 62 nodes.
Exchanging SafetyMonitors.................................................... 9
¢ Address 0 (the factory default address) is used for automatic
addressing and is not permitted on a running system.
LED Functionality (Modules)................................................. 10
¢ Modules with extended addressing and 4-in/4-out are permitted only
on networks where an M4 (3.0) master is used.
LED Functionality (SafetyMonitors)...................................... 11
Repeaters................................................................................ 12
Analyzer................................................................................... 14
Terminator and Tuner............................................................. 15
Building Networks.................................................................. 16
Power Supplies....................................................................... 18
Helpful Wiring Hints............................................................... 20
Common Problems and Solutions........................................ 30
¢ Update time per module is 150 µs. The formula for scan time is
150 μs x (number of addresses + 2).
- Single addresses require one scan.
- Dual addresses (a and b) require two scans.
- Dual addresses (a and b) 3.0 4-in/4-out require two scans for inputs
and 4 scans for outputs.
- Analog modules (2.1) require seven scans per point.
- Analog modules (3.0) require three or four scans per point.
¢ Network cable can be run in any topology.
¢ No shield or termination is required.
¢ Specification-compliant flat or round cable must be used.
¢ Do not ground either AS-i + or – under any circumstances anywhere
on the network (ground fault). The network has a differential
communication signal.
2
Subject to modifications without notice
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Subject to modifications without notice
Copyright Pepperl+Fuchs
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3
Addressing Modules
Handheld Programmer
¢ If only one module has failed:
• remove failed module,
• connect new module.
The handheld programmer is a diagnostic tool that is used to read the
inputs or set the outputs on a module. This is often done to isolate and
troubleshoot a specific I/O point.
As long as the new module is identical (i.e., has the same I/O and
ID codes and has address 0 before connection), no additional steps
are necessary.
¢ If more than one module has failed:
• remove all failed modules,
• use handheld programmer VBP-HH1 to manually assign
addresses to all but one replacement module,
• the last replacement module will receive its address automatically.
Note: The VAZ-PK-1.5M-V1-G addressing cable is required to work
with any module using an addressing jack.
¢ Make sure the handheld is in ADDR mode. This allows the address
to be read. Press the “MODE” button until the ADDR mode is
selected.
¢ Press “ADR” button and verify address is not zero.
(If zero, see previous page to set valid address.)
¢ Change mode to DATA by pressing the “MODE” button 4x or 7x
depending on module type. (Menu will repeat if you go to far.)
¢ Use arrow “⇧↑ ↓” buttons to select output value.
Setting an Address Using Handheld Programmer
¢ Press and hold “PRG” button to turn outputs on.
1. Connect the module to the handheld using
either the addressing cable, M12 receptacle, or
direct connection.
¢ Press and hold “ADR” button to read inputs.
Note: The chart below shows which
inputs or outputs are activated
when the hexadecimal digit is
displayed.
2. Press the “ADR” button to display the current
address of the module.
3. Use arrow “↑ ↓” buttons to choose new address.
4. Press “PRG” button to set selected address.
5. Press “ADR” button to confirm address.
The diagnostic LEDs on the gateway/scanner
indicate a fault when one or more modules are
missing or are not properly connected to network.
4
Procedure to Read Inputs and Set Outputs
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E
MOD
PRG
ADR
Data Bits
Inputs
Outputs
D3
D2
D1
I4
I3
I2
D0
I1
O4
O3
O2
O1
Display
Inputs
Outputs
0
1
2
3
4
5
6
7
none
I1
I2
I1, I2
I3
I1, I3
I2, I3
I1, I2, I3
none
O1
O2
O1, O2
O3
O1, O3
O2, O3
O1, O2, O3
Display
Inputs
Outputs
8
9
A
b
c
d
E
I4
I4, I1
I4, I2
I4, I2, I1
I4, I3
O4
O4, O1
I4, I3, I1 I4, I3, I2
F
I4, I3, I2, I1
O4, O2 O4, O2, O1 O4, O3 O4, O3, O1 O4, O3, O2 O4, O3, O2, O1
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5
Gateway Advanced Features
Config Error LED ON
Press OK
1. 5
UNKNOWN SLAVE
WARNING:
OUTPUTS MAY BE
RESET
Press OK
Press OK
Press ↓
Press ↓
DEVICENET
QUICK SETUP
SETUP
IO + PARAM. TEST
Press OK
STORE AS-I
CONFIGURATION
OK
STORE + PRJ MODE
STORE AS-I
CONFIGURATION
STORE + RUN
STORE + PRJ MODE
Press ESC twice
Config Error LED OFF
.
CONFIGURATION OK
Gateway LED Fuctionality
LED
Power
Config Error
6
Indication
Meaning
On (Green)
Power on
On (Red)
One slave missing or extra slave on the network
Flashing (Red)
Peripheral fault on network
U AS-i
On (Green)
AS-i network is sufficiently powered
AS-i Active
On (Green)
AS-i network operating normally in either configuration or
protected mode
PRG Enable
On (Green)
Exactly one slave is missing in protected operating mode
and automatic addressing is allowed
PRJ Mode
On (Yellow)
AS-i master is in configuration mode
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Some gateways have advanced diagnostic
features that can assist in finding network
problems. The built-in fault detector will display
new and old network errors. All advanced
diagnostics are found on the display by going to
ADV. DIAGNOSIS > AS-I CIRCUIT x > ...
Error Counters
¢ If a node requires at least two consecutive
retries, counts will appear on the display next
to that node address. A clean network will have
few or no retries. Single retries are automatically
handled at the AS-Interface chip level and
cannot be detected using the gateway. (Counts
always go up by two.)
¢ If any node has six consecutive retries, it appears
in the LCS with an X by the node address. (This
node caused a configuration error.)
Fault Detector
The following errors occurred in the past (HISTORIC)
or are currently happening (ACTUAL). Duplicate
addresses are also displayed on this screen.
EFLT: An earth or ground fault has occurred.
Check to make sure that AS-i + or - is not
touching machine ground anywhere.
OVRV: A power spike occurred on AS-i such that
the AS-i voltage was too high.
NOIS: Noise was detected. Route AS-i cable away
from potential noise sources.
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RS 232
PO
W
E
MN R
S
CO
NF
IG
AS ER
-i R
AS
-i A
PR CTIV
G
E
E
PR NA
J M BLE
OD
E
The gateway detects when modules are added or removed from the network
and indicates a “Config Error.” For gateways with a graphical display, use
the following procedure to make the detected configuration (i.e., all modules
found on the network) the active configuration.
U
Gateway Quick Start
ESC
+ASI-
Mode
Set
OK
ASI
+ASI- +PWR- NC NC
ERROR COUNTERS
RESET
1A - 0
2A - 0
LCS LIST OF
CORRUPTED SLAVES
RESET
APF - I 1A - x
FAULT DETECTOR
RESET
HISTORIC:
EFLT OVRV NOIS
ACTUAL:
EFLT OVRV NOIS
DUP ASI ADR:
0
I 31B
HELP:
EFLT EARTH FAULT
NOIS NOISE
DUP ASI ADR
DUPLICATE ASI
SLAVE ADDRESS
7
Exchanging SafetyNodes
Exchanging SafetyMonitors
Compared to standard modules, exchanging a SafetyNode requires a few
additional steps. See procedure for single and multiple node replacement.
1. Disconnect the failed SafetyMonitor from the 24 V DC power supply.
Both L+ and M must be removed!
Exchanging a Single Failed SafetyNode
2. Use the special download cable, VAZ-SIMON-RJ45. Connect the
new and old SafetyMonitors together.
1. Remove SafetyNode.
2. Lightly press the “Service” button on all affected SafetyMonitors.
LEDs 1, 2, and 3 will cycle slowly on the SafetyMonitor.
3. Connect replacement SafetyNode. Make sure it receives an AS-i
address and its inputs are closed so that full safety-code sequences
are received by the SafetyMonitor.
Service
Service
Removable
terminal
release tabs
4. Press the “Service” button on all affected SafetyMonitors. If successful,
LEDs 1, 2, 3 will turn off and the SafetyMonitor will start normally.
Exchanging Multiple Failed SafetyNodes
1. Remove all defective SafetyNodes.
2. Use handheld programmer VBP-HH1 to manually assign all addresses.
(See page 4.) Confirm there is no configuration error on gateway/
scanner. (Make sure all e-stops are pressed, all gates are open, and all
light curtains are broken such that S1 and S2 safety input LEDs are off
on all recently replaced SafetyNodes.)
3. The safety sequence must now be taught by following the procedure
in “Exchanging a Single Failed SafetyNode.” Repeat this procedure for
every recently replaced SafetyNode on the network.
ATTENTION! After replacing the defective SafetyNodes, make
certain to check the new modules for correct functionality.
8
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The replacement SafetyMonitor must be new with no configuration
or have a configuration that is not validated.
3. Power up replacement SafetyMonitor by connecting both L+ and M.
4. Press the “Service” button on replacement SafetyMonitor.
On the replacement SafetyMonitor, active transmission is indicated
when the yellow READY LED is illuminated. Transfer is complete
when the GREEN and YELLOW LEDs are both lit.
5. Disconnect defective SafetyMonitor and move all cables to
replacement SafetyMonitor. (Version 2.14 has keyed removable
terminals. Press the release tab in at the top of the monitor and pull
terminals straight up to remove.)
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9
LED Functionality (Modules)
LED Functionality (SafetyMonitors)
IN1
IN2
O1 O2
Service
I3
AS-i
LED AS-i 1
IN3
IN4
I4
Output circuit 1
I
PWR
FAULT
AUX
LED
PWR
AS-i
FAULT
PWR/FLT
AUX
I
In
O
Out
10
LED
Indication
Meaning
Off
No power
On (Green)
Normal
Flashing (Green)
Address 0 (FAULT LED on) or peripheral fault (FAULT
LED flashing)
Off
Normal
On (Red)
No AS-i communication; check address
Flashing (Red)
Peripheral fault; check I/O
Off
No power
On (Green)
Normal
On (Red)
No AS-i communication; check address
Alternating (Red/Yellow)
Address 0
Alternating (Red/Green)
Peripheral fault; check I/O
OFF
No AUX power; check black AS-Interface cable
ON
Normal
OFF
Input OFF; no AUX power or wire broken
ON
Input ON
OFF
Output OFF; no AUX power or output not set by PLC
ON
Output ON
ON
Output shorted/overloaded (if supported by module)
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AS-i S
LED AS-i 2
Indication
1
2
3
1 READY
2 ON
3 OFF/FAULT
1
2
3
Output circuit 2
(on dual-channel units only)
II
Meaning
Off
No 30 V AS-i connection to AS-i+ and AS-i- terminals
On (Green)
Normal
Off
Normal operation
On (Red)
No AS-i communication or monitor address not stored in
gateway/scanner
On (Yellow)
Waiting for start condition or door unlock condition
Flashing (Yellow)
Safety module test, local acknowledge required, or
diagnostic stop enabled
On (Green)
Contacts of the output switching elements closed
Flashing (Green)
Delay time runs in event of Stop Category 1
On (Red)
Contacts of the output switching elements open
Flashing (Red)
Error on level of the monitored AS-i components
1 READY
2 ON
3 OFF/FAULT
Simultaneously
flashing rapidly
Internal device error; power cycle is required
1 READY
2 ON
3 OFF/FAULT
Cycling slowly
Learning safety code sequences
1 READY
2 ON
3 OFF/FAULT
Off
No 24 V supply connected to L+ and M terminals
AS-i 1
AS-i 2
1 READY
2 ON
3 OFF/FAULT
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11
Repeaters
Repeaters
The communication path between an AS-i module and gateway/scanner
must not go through more than two repeaters. This example shows a
network with five segments, four repeaters and a total length of 500 m.
Note the position of the gateway in the middle segment.
AS-Interface
Power Supply
AS-Interface
Power Supply
AS-Interface
Power Supply
I/O
Module
AS-Interface
Power Supply
AS-Interface
Power Supply
AS-Interface
Scanner/Gateway
Repeater
I/O
Module
I/O
Module
AS-Interface
Power Supply
AS-Interface
Power Supply
Repeater
I/O
Module
100 m total cable length
Repeater
I/O
Module
100 m total cable length
Repeater
I/O
Module
100 m total cable length
Repeater
I/O
Module
100 m total cable length
AS-Interface
Scanner/Gateway
I/O
Module
I/O
Module
100 m total cable length
PWR
FAULT
Off
12
AS-Interface
Power Supply
2
Enclosure
FL
T2
PW
R
R
FL 1
T1
Meaning
AS-Interface
segment 2
Repeater
No power supply connected
I/O
Module
On (Green) Normal
Off
Normal
On (Red)
No communication
A network that is properly setup will have:
¢
¢
¢
¢
PW
Indication
AS-Interface
segment 1
one gateway/scanner,
one power supply per segment,
no segment with more than 100 m total cable length,
no module separated from the gateway/scanner by more than two
repeaters.
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I/O
Module
Wiring field-mount repeater, VAR-G4F
A repeater adds a second galvanically isolated segment to the AS-i
network. Because only communication passes through the repeater
a second power supply is required. Never put more than one power
supply on a segment!
LED
I/O
Module
AS-Interface
Scanner/Gateway
AS-Interface
Power Supply
I/O
Module
I/O
Module
Wiring enclosure-mount repeaters, VAR-KE3-TERM or VAR-KE2
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13
Analyzer
The network analyzer, VAZ-ANALYZER, provides information about
network stability and allows detailed analysis of protocol-specific
communication detail.
There are two modes of operation. The first is online statistics where the
overall health of the network is read. The second is trace mode where
individual AS-i telegrams are recorded, filtered, and viewed for later
analysis. This mode is often used to track down specific input, output
or timing problems.
Online Statistics
Advance statistics (check for)
- Little or no missing telegrams
-No slave telegrams without
master call
Consecutive errors
-Make sure consecutive
errors are kept to
a minimum. (6x =
configuration error)
Network overview
-Check to make sure all
connected nodes are
green.
I/O data
-Verify that the input and output data is correct.
-Find out if a certain input is flickering or turning on for a short time by
running a trace on that input.
Terminator and Tuner
The fixed terminator, VAZ-TERM, extends the network to 200 m, and the
tuner, VAZ-TUNER, extends the AS-i network to 300 m. These devices,
however, will not correct problems caused by noise or bad AS-i cable.
Requirements for Installation
¢ The best network to extend is linear. A network that has many
drops/branches may not be extendable.
¢ The power supply must be located at one end of the network
segment and the terminator/tuner at the other end.
¢ If a repeater is to be used, an “Advanced” repeater is required. The
advanced repeaters VAR-G4F or VAR-KE3-TERM (with termination
switch built in) have a faster response time, which is required to
couple long segments together.
¢ Always use analyzer VAZ-ANALYZER to verify network integrity.
Tuning Procedure
Gateway/scanner:
1. Put in configuration mode by
holding “mode” button for
5 seconds.
Tuner:
1. Rotate “mode” switch to 2
(tuning).
2. Press “set” button until
LEDs strobe red, yellow,
green, red....
Tuner LED Indication
LED
Indication
Error
On (Red)
Meaning
Warning
On (Yellow) 1% to 5% retries
Green
On (Green) Less than 1% retries
Greater than 5% retries
Terminator LED Indication
Indication
Off
Meaning
No power or voltage below 18.5 V
On (Yellow) Voltage above 18.5 V
On (Green) Voltage above 26 V
4. When strobing stops (this
may take several minutes), rotate “mode” switch to 3 (run).
14
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15
Building Networks
Building Networks
AS-Interface networks are easy to build with only a few guidelines.
Communication between a gateway/scanner and module cannot pass
through more than two repeaters. Additional network wiring restrictions are
necessary if terminators or tuners are used to build even longer networks.
AS-Interface
Power Supply
¢ Terminators and tuners should be located as far away from the
power supply as possible within the segment.
¢ Use only VAR-G4F and VAR-KE3-TERM advanced repeaters when
using terminators and tuners to extend the network.
Terminator
Power
Supply
Terminator
Power
Supply
Terminator
AS-Interface
Scanner/Gateway
Repeater
Repeater
¢ Use an AS-i analyzer to verify proper terminator and tuner operation.
¢ See Terminator and Tuner section for proper tuning procedure.
¢ Tune the segments only in configuration mode (PRJ mode LED on).
200 m total cable length
200 m total cable length
200 m total cable length
600 m network using repeaters and terminators
¢ Tune segments one at a time starting with segments closest to the
gateway/scanner. Disconnect segments that are not already tuned.
AS-Interface
Power Supply
AS-Interface
Power Supply
Power
Supply
Power
Supply
Power
Supply
Tuner
Tuner
AS-Interface
Scanner/Gateway
AS-Interface
Scanner/Gateway
Repeater
100 m total cable length
Repeater
Repeater
100 m total cable length
100 m total cable length
300 m network using repeaters
16
Power
Supply
Tuner
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300 m total cable length
Repeater
300 m total cable length
300 m total cable length
900 m network using repeaters and tuners
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17
Power Supplies
Power Supplies
Power supplies used for AS-Interface are specifically designed for this
network. No standard DC power supply can be used unless it first goes
through a power conditioner. Only a few wiring guidlines are required:
¢ Exactly one AS-Interface power supply is required for each segment.
Standard power
supply wiring
13 14 + + GND - -
13 14 + + GND - -
VAN-115/230AC-K21-EFD
VAN-115/230AC-K21-EFD
SYS AS-i OK
¢ Some gateways have duplicate address detection. To use this
feature, the power supply must be connected directly to the
dedicated terminal (labeled +PWR-) on the gateway.
prj mode
AS-i act
PWR
prg enable
DC OK
EFD
Reset
RS-232
mode
Power supplies with
ground fault detection
DC OK
EFD
Reset
EFD int.
EFD ext.
set
L
N
EFD int.
EFD ext.
L
N
AS-Interface Network 1
Floating EFD output
VAN-115/230AC-K21-EFD
LED Power (Green)
DC OK
EFD
Reset
LED Overload (Red)
EFD int.
EFD ext.
DeviceNet connector
AS-i 1 V+ (Red)
2 CAN H (White)
AS-i +
3 Shield
4 CAN L (Blue)
Ground
5 V- (Black)
PO
W
E
MN R
S
CO
NF
U IG E
AS R
-i R
AS
-i A
PR CTIV
G
E
E
PR NA
J M BLE
OD
E
RS 232
Connect AS-i segment here
(Connect ground terminal to machine
ground and the shield of AS-i cable if used)
DeviceNet connector
1
2
3
4
5
V+ (Red)
CAN H (White)
Shield
CAN L (Blue)
V- (Black)
L
Power OK (Green)
Ground fault indication LED (Red)
Reset button:
press < 1 s simulates ground fault,
RS 232press > 2 s to reset ground fault
N
Display
Attach standard AC input voltage here
+ASI-
Mode
Set
OK
ESC
Ground
ASI
+ASI- +PWR- NC NC
PE
N
L
ESC
Mode
Set
OK
ASI1
ASI2
+ASI- +PWR- +ASI2- +PWR-
PE
N
L
AS-i -
AS-i -
AS-i +
AS-i +
Ground
Power supply connection for gateways
ESC
RS 232
Internal/external ground fault switch:
EFD int. – shuts off on ground fault,
use pushbutton to reset
EFT ext. – automatically recovers
from ground fault (default)
Display
Ground
Dual network A-B ControlLogix scanner card connected to two power
supplies with ground fault detection
PO
W
E
MN R
S
CO
NF
U IG E
AS R
-i R
AS
-i A
PR CTIV
G
E
E
PR NA
J M BLE
OD
E
13 14 + + GND - -
115/230 V switch
(Only on K24 supply)
AS-Interface Network 2
Connect to AS-i segment here
(Connect ground terminal to
machine ground and the shield
of AS-i cable if used)
PO
W
E
MN R
S
CO
NF
U IG E
AS R
-i R
AS
-i A
PR CTIV
G
E
E
PR NA
J M BLE
OD
E
Attach standard AC
input voltage here
PE
N
L
+
–
Mode
Set
Ground
OK
ASI1
ASI2
+ASI- +PWR- +ASI2- +PWR-
AS-Interface Network 2
AS-Interface Network 1
AS-i Network
18
AS-i Power Supply
AS-i Network 1
AS-i Network 2
Power Supply
AS-i Network 1
Power Supply
AS-i Network 2
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Dual network gateway with duplicate address detection connected to
two standard AS-i power supplies
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19
Helpful Wiring Hints
DON’T
Helpful Wiring Hints
DO
DON’T
Don’t run AS-i cable parallel to potential noise Separate AS-i cable and noisy cable by at
sources.
least 0.2 m.
✘
0.2 m
DON’T
Don’t fasten yellow AS-i and black auxiliary
cable on top of each other.
DO
✘
✓
Place the AS-i power supply at one end of
the network and terminator/tuner at the
other end.
✓
✘
✓
Separate the black and yellow flat cables.
Outputs connected to drives or motors can
cause black AUX cable to be noisy.
DO
Don’t locate terminator/tuner next to the AS-i
power supply.
DON’T
DO
Don’t use noncompliant or out of specification Use correct wiring practices when using
AS-i cable i.e., twisted, shielded, or, wrong
shielded cable including cable length
impedance.
reduction to 80 m max. and land shield on
GND terminal on power supply.
AS-i -
✘
AS-i +
Ground
20
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✓
AS-i AS-i +
Ground
21
Helpful Wiring Hints
DON’T
Helpful Wiring Hints
DO
DON’T
Don’t power standard devices with AS-i cable. Power only AS-i certified devices with the
AS-i cable. AS-i devices have special filtering
components that safely pull power from the
network.
PNP Sensor
Allow the AS-i signal to float properly. AS-i
derives much of its noise immunity from this
floating signal. Tying one lead to ground will
interfere with the AS-i communication.
PNP Sensor
✓
✘
DON’T
Don’t place AS-i and noisy components next
to each other in a panel.
DO
Don’t ground AS-i anywhere on the network
under any circumstances.
DO
✘
AS-i -
AS-i +
AS-i +
Ground
Ground
DON’T
Keep the AS-i components on one side of
panel and high-frequency drive components
on the other. Separate them with a metal
divider, if possible, and make sure cables do
not exit at the same location.
✓
Don’t neglect to check the number of retries
on the AS-i network.
DO
Use the AS-i analyzer to ensure that the
network is error free. Capturing the network
health during project buyoff can relieve
machine builders of future liability if changes
are made.
✘
ERROR COUNTERS
RESET
1A - 48
2A - 6
22
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✓
✘
AS-i -
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✓
ERROR COUNTERS
RESET
1A - 0
2A - 0
23
Helpful Wiring Hints
DO
DON’T
Use repeaters in a star topology around the
AS-i scanner/gateway, or use a terminator
and tuner to maximize the network length.
Power Supply
Power
Supply
Power
Supply
Power
Supply
✘
AS-Interface
Scanner/Gateway
Repeater
Repeater
RS 232
For redundancy, use two standard 30 V power
supplies connected to a power condintioner.
PE
N
L
+ASI-
Mode
Set
OK
ASI
+ASI- +PWR- NC NC
AS-i -
AS-i -
AS-i +
AS-i +
Ground
100 m
✓
Power Supply
Power
Supply
Power
Supply
RS 232
✓
Terminator
AS-Interface
Scanner/Gateway
Repeater
Repeater
ESC
+ASI-
100 m
24
100 m
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Ground
100 m
PO
W
E
MN R
S
CO
NF
IG
AS ER
-i R
AS
-i A
PR CTIV
G
E
E
PR NA
J M BLE
OD
E
100 m
U
100 m
PE
N
L
✘
ESC
Repeater
DO
Don’t use more than one AS-i power supply
on a network.
PO
W
E
MN R
S
CO
NF
IG
AS ER
-i R
AS
-i A
PR CTIV
G
E
E
PR NA
J M BLE
OD
E
Don’t use more than two repeaters in a row.
U
DON’T
Helpful Wiring Hints
Mode
Set
PWR 1
U>26 V
PWR 2
U>28 V
OK
ASI
+ASI- +PWR- NC NC
+
+
NC +30 V 0 V
FE
200 m
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25
Helpful Wiring Hints
Helpful Wiring Hints
DON’T
RS 232
PO
W
E
MN R
S
CO
NF
U IG E
AS R
-i R
AS
-i A
PR CTIV
G
E
E
PR NA
J M BLE
OD
E
ESC
Mode
Set
OK
ASI1
ASI2
+ASI- +PWR- +ASI2- +PWR-
I/O Module Wiring
DO
Don’t use one power supply to power two
networks.
PE
N
L
Use the dual-channel power conditioner,
VAN-KE2-2PE, or use two separate power
supplies, one for each network.
DON’T
DO
Don’t use the input power terminals (IN+, IN-) Use these terminals to provide power to
for anything other than what they were
sensors and other input type devices only.
designed for; powering sensors.
AS-i I 1 I 2 I 3 I 4
IN1 IN2 IN3 IN4
I+ 1 I + 2 I + 3 I+ 4
✘
AS-i +
Ground
I 1 I 2 I 3 I 4
IN1 IN2 IN3 IN4
I+ 1 I + 2 I + 3 I+ 4
✘
+
PO
W
E
MN R
S
CO
NF
U IG E
AS R
-i R
AS
-i A
PR CTIV
G
E
E
PR NA
J M BLE
OD
E
PE
N
L
AS-Interface Network 1
Mode
Set
PE
N
L
DON’T
OK
ASI1
ASI2
+ASI- +PWR- +ASI2- +PWR-
AS-i -
AS-i -
AS-i +
AS-i +
Ground
Ground
✓
DO
Don’t ground input signals that are powered
by the AS-i network through the I/O modules.
Allow the AS-i module to completely power
inputs connected to the module if designed to
do so. If the resistance to ground is <10 MΩ
inputs should be powered externally.
AS-Interface Network 2
AS-Interface Network 1
26
✓
AS-Interface Network 2
RS 232
ESC
+
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✘
Subject to modifications without notice
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✓
27
Helpful Wiring Hints
DON’T
Helpful Wiring Hints
DO
Don’t run inputs connected to safety modules
with long cables or run inputs close to
potential noise sources.
Place AS-i safety modules as close as
possible to safe inputs or use Safety at Work
components with direct communication
to AS-i. The safety sequence runs over
safe input lines and any disruption of this
sequence can cause nuisance shutdowns.
DON’T
DO
Don’t run the AS-i + and AS-i - wires apart in
the same enclosure.
PE
N
L
✘
Do run the AS-i conductors together preferably
in the same jacket. This eliminates current
loops and allows proper noise rejection to
occur on the network.
✘
AS-i AS-i +
Ground
✓
PE
N
L
AS-i AS-i +
Ground
28
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✓
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29
Common Problems and Solutions
The number 41 is on the gateway display. There is no AS-i communication.
What do I do?
Check to ensure that exactly one power supply is used for each AS-i segment. This can be checked
easily by powering down each of the AS-i power supplies, one at a time. The PWR LEDs on all of
the nodes within each segment must go off. The U-AS-i LED on the segment connected to the AS-i
gateway/scanner must also go off.
Make sure the AS-i power supply is not being used to power auxiliary devices. Disconnect the
auxiliary power supply. Walk around to every AS-i node and make sure that the AUX LED is off.
The node is addressed correctly and connected to the network. The PWR
LED is red and the AS-i scanner can’t see the node. What do I do?
Check for duplicate addresses. Use gateways or safety monitors with duplicate address detection.
If these gateways are wired properly (see pg. 19), problems can be found easily. If this feature is
not available, read the LDS (List of Detected Slaves) and check the nodes on the network. These
addresses must match exactly. Disconnect duplicate and see if node appears. If so, a node with
same address exists somewhere else on the network.
How do I know if my network is running properly by using the LEDs on the
scanner/gateway and the LEDs on the nodes?
A properly running AS-i network will have the following LED states:
Gateway/Scanner LEDs
Power/PWR
Config Error/FAULT
U AS-I
AS-i Active/act
PRG enable
PRJ Mode
OK/SYS
On (Green)
Off
On (Green)
On (Green)
Off
Off
On (Green)
(scanner cards only)
On (Green)
Off
On (Green)
On (Green)
What do the numbers mean on the gateway’s 2-digit, 7-segment display?
Gateways/scanners will show AS-i addresses and error codes on the display. While in run mode,
(PRJ LED off) the display should be blank. Numbers on the display that range from 1-31 are
addresses of the nodes that are faulted; they are not error codes. Numbers greater than 31are
gateway error codes. The two most common error codes are 40 and 41.
30
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40 – Offline phase: There is no power to the AS-i network causing it to be offline; or the network
has been taken offline manually using the keypad or data bits in the PLC/PC. Gateway would say
OFF-LINE by host if this was the cause.
41 – Detection phase: Gateway will remain in this phase until at least one node is found. Place
nodes on network making sure there are no duplicate addresses. Also check for miswired power
supply, two power supplies on one network, one power supply on two networks, or the use of a
noncompliant 24 V DC power supply.
My network is unstable. What are possible causes, and how do I fix them?
AS-i cable length could be too long or noncompliant cable was used. AS-i cable length is measured
as the sum of the trunk cable and all drops. The AS-i specification, though conservative, is 100 m
maximum. Exceeding this length could result in unnecessary retries by the AS-i scanner/gateway.
Reduce the segment length by adding a repeater and power supply. Make sure that new segments
are under the 100 m limit. NOTE: When “over length” network problems occur, the nodes closest to
the AS-i master/scanner are often those that are most affected.
I connected a new AS-i module to the network and stored the configuration.
It won’t communicate. What could be the problem?
Check in the AS-i Reference & Buyer’s Guide for the minimum master specification you must have
to use this module properly.
• If a node has 4 in/4 out and extended addressing, it can only be used on M4 (3.0) masters
Node LEDs
PWR(AS-i)
FAULT
PWR(AS-i)/FAULT
AUX
Common Problems and Solutions
• Nodes with extended addressing that are used on 2.0 (M0, M1, M2) masters must leave
parameter bit P3 on and data bit D3 off. These bits, used to toggle between A/B addresses
in spec. 2.1, are defined only as data bits in earlier specs. Changing these bits will cause the
nodes to go offline.
I am looking at the retry counters on the gateway and notice that the number
of retries is significant. What can I do to eliminate them?
Frequently, it is only one AS-interface node that is causing a problem on the AS-i network. This
is usually due to miswired components in remote panels. Use the retry counters in the gateways
or, even better, use the AS-i analyzer to connect nodes one at a time. When a node is added that
starts generating retries anywhere on the network, the cause is probably in the wiring to that node.
NOTE: A network retry of a node on AS-i does not mean that the problem is with that particular
node. The AS-i network is connected to all nodes, so a wiring problem on one node can affect the
entire network.
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31
Contact
Pepperl+Fuchs Inc.
1600 Enterprise Parkway
Twinsburg, Ohio 44087 · USA
Tel. +1 330 486-0001 · Fax +1 330 405-4710
E-mail: [email protected]
Worldwide Headquarters
Pepperl+Fuchs GmbH · Mannheim · Germany
E-mail: [email protected]
USA Headquarters
Pepperl+Fuchs Inc. · Twinsburg · USA
E-mail: [email protected]
Asia Pacific Headquarters
Pepperl+Fuchs Pte Ltd · Singapore
Company Registration no. 199003130E
E-mail: [email protected]
www.pepperl-fuchs.com
Subject to modifications • © 2009 PEPPERL+FUCHS, INC. • Printed in USA • Part No. 912040 07/09 03
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