CsCAN Protocol

See also: Help for Serial Protocols

 

 

Overview

The CsCAN serial downloadable protocol is for communication between peer to peer. This is a Master/Slave protocol.

CsCAN protocol supports master only operation to the slave using the CsCAN protocol. Communication is via the 9 pin ‘D’ type Female connector and RJ45 connector.

 

 

Cscape Configuration

To configure OCS for the CsCAN protocol, select the Protocol Configuration from the Program menu in Cscape software. Select the appropriate protocol type on the desired port. To make sure that the Software is able to configure the equipment for the correct protocol, ensure Cscan.dll file is in the Protocols directory of the current working/open Cscape.

 

 

Serial Port Configuration

The default link settings for the terminal (fixed) are: 9600 baud, 8 data bits, No parity, 1 stop bit, No handshaking and RS232 communications mode.

Using CsCAN protocol, all register types become available directly over the serial protocol.

 

 

Node Address

If used on a 1 to 1 connection to an OCS, the address is set to the same as that of the connected OCS. If not known, this value can be seen from the OCS SYSTEM menu.

 

 

Selecting Device Register Type

Click on Program and then select Protocol Config.

 

 

Network Configuration

 

 

Device Config

Specify slave Name and CsCAN ID.

NOTE: This network ID should be same as set in System Menu of Slave Device.

 

 

Enter the desired parameter address in the Device Register field.

 

 

 

Register Ranges

Register Type

Register Name

Range

Data Type

Analog IN

%AI

1-512

RW-16 bit Word

Global Analogue IN

%AIG

1-32

RW-16 bit Word

Analogue OUT

%AQ

1-512

RW-16 bit Word

Global Analogue OUT

%AQG

1-32

RW-16 bit Word

Digital Inputs

%I

1-2048

RO-Bit or Word

Global Digital IN

%IG

1-64

RO–Bit or Word

Function Keys    

%K

1-12

RO-16 bit Word

Retentive Coils

%M

1-2048

RW-Bit or Word

Output Coils

%Q

1-2048

RW-Bit or Word

Global O/P Coils

%QG

1-64

RW-Bit or Word

Data Registers

%R

1-9999

RW-16 bit Word

System Bits

%S

1-16

RO-Bit

System Registers

%SR

1-192

RO-Word

Temporary Bit

%T

1-2048

RW-Bit or Word

 

RW=Read/Write RO=Read Only.

 

NOTE: %R registers are shared with Counters, Timers & general data words. Also if %R registers have been formatted in special ways e.g. Real Numbers, the protocol has no way of knowing this. Therefore care must be taken to match data types to be compatible at both ends.

 

 

Network Communication Errors

In order to access the Network statistics, user must assign the “Network status register” in network configuration. The table below gives the details of statistics.

 

Number Statistics Location Description

 

 

 

 

1

Update interval exceeded count

%Rx

This register explains number of times that the actual transaction scan time to complete all transactions exceeded specified update interval. Generally used as an indicator that an excessive number of triggered transfers or failed communication retries are occurring that is lengthening the expected transaction scan time.

 

If the Update interval is set to zero (update as fast as possible), this 32-bit register alternately specifies the actual transaction scan time in mSec resolution.

2

No response count

 %R(x+2)

This register explains number of times that a device(s) did not respond to a transaction. This includes ALL failed transaction, not just those after the retry count is exceeded.

3

Corrupt Response Count    

 %R(x+4)

This register explains number of times that a device(s) returned an invalid or failed response to a transaction.  This includes ALL failed.

 

Transaction, not just those after the retry count is exceeded.

4

Valid Response Count   

 %R(x+6)

This register explains total number of valid responses.

 

NOTE: %Rx: 32-bit network status register configured in Network configuration. For example: %R500(501).

 

 

Device Communication Errors

Error Error Number Description

INVALID_BLOCK

-203

 Invalid size for data type.

NO_RESPONSE_FROM_PLC

-204

Timeout while waiting for remote node response.

INVALID_RESPONSE_FROM_PLC

-205

Corrupted response from remote node.

INVALID_INITIALISATION

-207

Internal Error - Unable to open port.

 

 

Connection Details

Illustrations below show the various end-of-cable connectors required:

 

25-Pin D-Type Male 10-Pin Weidmuller
Cage Clamp 		8-Pin RJ 45 Plug 9-Pin DB Male
CN1 CN1 MJ1/MJ2 Port 1

 

 

Following table indicates the Summary of the Serial port pin details for Serial communication. With this information RS-232/485/422 communication cables can be done.

 

Port 1 — DB9 (Female at OCS end)

MJ1/MJ2 — RJ45 (Female at OCS end)

CN1 — 10-Pin Weidmuller Cage Clamp (Female at OCS end)

CN1 — DB25 (Female at OCS end)

 

NOTES:

  • Do not connect to unlisted pins.

  • Recommended Cable: Beldon 9503, twisted multipair, screened.

  • Connect the screens together at the shield / earth pin of the PLC.

 

Port 1 — DB9 (Female at OCS end)

MJ1/MJ2 — RJ45 (Female at OCS end)

CN1 — 10-Pin Weidmuller Cage Clamp (Female at OCS end)

CN1 — DB25 (Female at OCS end)

 

NOTES:

  • Do not connect to unlisted pins.

  • Recommended Cable: Beldon 9503, twisted multipair, screened.

  • Connect the screens together at the shield / earth pin of the PLC.