1. OVERVIEW
MELSEC-A
1-1
1. OVERVIEW
This manual explains the specifications, handling and communication services for type
AJ71PB96F/A1SJ71PB96F PROFIBUS-FMS interface module (hereafter abbreviated as
AJ71PB96F/A1SJ71PB96F, when explain separately, however, abbreviated as AJ71PB96F,
A1SJ71PB96F.) for connecting the A Series PC to the PROFIBUS-FMS network.
The AJ71PB96F/A1SJ71PB96F operates as the master station in the PROFIBUS-FMS network and
communicates with slave stations or other master stations.
1.1 Software
Configuration
The AJ71PB96F/A1SJ71PB96F contains a Physical layer, Datalink layer, Application layer, and VFD
(Virtual Field Device) that comply with PROFIBUS-FMS and conducts data communication with the PC
CPU using a general data interface and buffer memory.
The software configuration is shown in the following diagram.
FROM/TO
VFD
FMS
LL
FDL
PHY
FMA7
empty
FMA1/2
A Series PC
General
data
interface
Communication using
buffer memory
PC CPU device
read/write
communication
7th layer: Application
3rd layer to 6 th layer
2nd layer: Datalink laye
1st layer: Physical layer
Table 1.1 Software configuration
*FMS, LLI, FDL, PHY, FMA7, FMA1/2...PROFIBUS Protocol
