Руководство - руководство по программированию в среде U90 Ladder (англ.язык)
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Communications
121
How the Controller works with SMS messaging
To allow the controller to use SMS messaging, you select 'Use SMS messaging' in the Controller>SMS SMS
Configuration box.
The charts below show the actual process--exactly how the controller initializes and works with a GSM modem.
This information is provided for advanced users who may require it for a specific application, or for
troubleshooting.
Initialization
After initialization, the M90 can send and receive SMS messages.
Sending Messages
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Note that a cell phone will not be able to receive a message if its SIM card is full.
Receiving SMS messages
The chart below shows how the M90 receives SMS messages. It also shows what happens if the M90 receives
an SMS message marked 'Acknowledge'.
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SMS messaging problems
You can begin troubleshooting by entering Information Mode. You can then check the status of relevant System
Bits and Integers to help diagnose the problem.
To begin diagnosing the problem, check the error codes contained in SI 70 and SI 180.
The tables below show the more common causes of SMS communication problems.
Problem SI 70 value Possible Cause & Recommended Action
Modem fails to
initialize
2: Modem Did Not
Reply
PLC-to-GSM modem cable:
Make sure that the cable is securely connected. Check the pin-out of
the PLC-to-modem adapter cables. Note that if you use cables
comprising this pin-out, you must set the RS232 parameter Flow
Control to N (none).
Incompatible communication settings.
Most modems automatically match the parameters of incoming data:
baud rate, data bits, parity & stop bits.
M90/91 embedded GSM modem settings are: 19200, 8 data bits, no
parity, 1 stop bit.
Jazz embedded GSM modem settings are: 9600, 8 data bits, no parity,
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1 stop bit
You may need to manually change your modem's communication
settings to match these.
0: No Error SB 72 / SB180: OFF
In order to work with a GSM modem , you must select 'Use GSM
modem' in the SMS configuration box . This causes SB 72 Initialize
Modem and SB 180 Initialize GSM modem to turn ON when the PLC
powers up.
Check that these SBs are not disabled in your program.
6: Modem Report
Error
Check the modem initialization commands. Refer to the topic PLC-
side Modems.
Other Common Problems:
Problem SI 180 value Possible Cause & Recommended Action
GSM modem not
Initialized
1 Refer to table above
Wrong PIN number 5 Check the PIN number contained in the SMS Configuration box, leave
it empty if your SIM card has no PIN number.
Failed Registration
6
GSM modem did not register successfully, for example if no network
was found, or if the modem antenna is not functioning.
PUK number
needed
17
The SIM card is locked due to too many attempts to enter an incorrect
PIN number.
Cell phone does not
receive message
No value Check the cell phone's SIM card; it may be full. You can clear the SIM card
using SB 193 Delete all SMS messages from SIM card.
125
Networks
About M90/91 Networks
You can create a decentralized control network of up to 63 controllers using CANbus-enabled M90 models. This
is sometimes called a multi-master network. In an M90 network, CANbus enables inter-PLC data exchange.
Technical specifications and wiring diagrams are given in the M90 User Guide.
Using your PC, you can access a networked M90 unit via its RS232 port. You can then view, read, and write
data into any unit. This feature can also allow you to view your network via a SCADA program.
Assigning a Unit ID number
When you create an M90 network, you must assign a Unit ID number to each controller. A Unit ID number is
unique. It must be used only once within a network.
You use this number for two purposes:
To enable the M90 controllers to exchange data.
To access a networked M90 via your PC.
To set a Unit ID number:
1. Click Controller on the Standard menu bar.
2. Select OPLC Settings from the Controller menu.
3. The OPLC Settings window opens.
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4. Enter the new ID number in the Unit ID window.
5. Click << Set to enter the new IN number.
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Displaying the Unit ID Tool Bar
1. Display the Unit ID by selecting ID from the Controller menu.
2. The Unit ID tool bar opens as shown below.
To download via an M90 bridge to a networked M90, you must select the unique ID of the networked M90.
When you enter '0' as the Unit ID number, you communicate directly with the M90 that you are using as a
bridge to the network.
CANbus Networking
CANbus enables inter-PLC data exchange.
CANbus Specifications
Power Requirements: 24VDC (±4%), 40mA max. per unit
Galvanic Isolation between CANbus and controller: Yes
Baud rate Max. Network Cable Length:
1 Mbit/s 25 m
500 Kbit/s 100 m
250 Kbit/s 250 m
125 Kbit/s 500 m
100 Kbit/s 500 m
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50 Kbit/s 1000 m
20 Kbit/s 1000 m
Note
Cable lengths over 500 meters require an additional power supply.
Wiring Considerations
Use twisted-pair cable. DeviceNet® thick shielded twisted pair cable is recommended.
Network terminators: These are supplied with the controller. Place terminators at each end of the CANbus network.
Resistance must be set to 1%, 121Ω, 1/4W.
Connect the ground signal to the earth at only one point, near the power supply.
The network power supply need not be at the end of the network.
Maximum number of controllers in a network: 63.
Wiring Diagram
When you create a CANbus network, you assign each controller a unique Unit ID number, 1 through 63.
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You use these unique ID numbers when you write your network control program. You address operands using
the unique ID number. This allows the M90 units to access data from other controllers, using special SIs and
SBs in combination with the Unit ID number.
Each controller can read the information contained in SI 200 & SI 201 and SB 200- SB 207 and 16 first Inputs
I 0 - I 15 in other units.
To read the information from a controller, the addressing to an SI or SB must be combined with the Unit ID
number of the controller being read from.
Example:
We want to add the value in SI 200 in unit #2 with another MI.
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CANbus networking is featured in several sample applications, check the application ' 8 PLCs + Alarm' .
Note •
Unitronics’ CANbus control network is run by a separate isolated power supply that is not
part of the network power supply.
•
Note: You can connect up to 63 units in a CANbus network. Each controller can read
information from up to 8 other controllers in the network.
Using your PC to access a network
You can use your PC to access any M90 unit within a network. To do this, you connect your PC to any M90 in
the network using the programming cable supplied with the M90 controller as shown below. This M90 is your
'bridge' to the rest of the network.
Via the bridge, you can download, upload, and edit programs--you can perform any action that can be performed
via direct communications. You can also view runtime data. This does not affect the running of the control
program.