Connection Setup

<< Click to Display Table of Contents >>

Navigation:  »No topics above this level«

Connection Setup

Return to chapter overview

Handshake Procedure

Before the communication between the CC-Link master and the CC-Link slave (IC2 controller) is possible, the handshake process needs to take place. Without it no data from the master will be transmitted to station. The procedure has 3 steps:
 
1. If the network parameter are correct, the slave station will set the bit "Initial data processing request flag".

2. Upon receiving thi bit, the master answers to the request with the bit "Initial data processing complete flag".

3. Finally, the station (slave) sets the bit "Remote READY". That means the slave is in the normal operation mode.

 

Handshaking

 

Location of the handshake bits

Slave (Controller) à Master

Device

Signal name

RX(m+n)8

Initial data processing request flag

RX(m+n)9

Initial data setting complete flag

RX(m+n)A

Error status flag

RX(m+n)B

Remote READY

 

Master à Slave (Controller)

Device

Signal name

RY(m+n)8

Initial data processing complete flag

RY(m+n)9

Initial data setting request flag

RY(m+n)A

Error reset request flag

 

The two tables are showing the part of the memory, mapped in bits, where the handshake flags are located.

m - Address assigned to the master module by the station number setting. This defines the memory area dedicated for this slave. It begins at address m of the master.

n - It depends on the number of occupied stations and the extended cyclic setting, as shown in the table:

 


Case 1

Case 2

Number of
occupied stations

1

4

Extended
cyclic setting

Octuple

Double

n

0x7

0xD