IMAC2B009 V2
Uncontrolled Copy - Refer to Ampcontrol Website for Latest Version
Page 8 of 53
Ampcontrol Pty Ltd
– ABN 28 000 915 542
iMAC System User Manual
iMAC2B009 V4
– 10/18
A
P
P
R
OV
E
D
FOR
E
X
T
E
R
N
A
L
D
IS
TR
IB
U
T
ION
–
P
R
OP
E
R
T
Y
OF
A
M
P
C
ON
TR
OL
P
T
Y
LTD
–
N
O
T
T
O
B
E
R
E
P
R
OD
U
C
E
D
I
N
P
A
R
T
Definitions
1.3.1 System Definitions
Term
Definition
2-Wire System
A 2-Wire iMAC system has a fieldbus that contains a Signal Line and a Common
Line. The Signal Line is fed through all of the emergency stop contacts and
terminated into the EOL module. In a 2-Wire System, all iMAC fieldbus modules
communicate over the Signal Line. This means that if an emergency stop is
activated, the Signal Line is broken and all modules downstream of the activated
emergency stop will lose communication with the iMAC2 Controller.
3-Wire System
A 3-Wire iMAC system has a fieldbus that contains a Signal Line, Monitoring Line
and a Common Line. The Signal Line is fed through all of the emergency stop
contacts and terminated into the EOL module. The Monitoring Line is terminated
into an MEOL module. In a 3-Wire System, all iMAC fieldbus modules communicate
over the Monitoring Line. The advantage of the 3-Wire System, over the 2-Wire
System, is that when the Signal Line is broken by an emergency stop,
communication with all modules is still possible via the Monitoring Line.
A-Line
The Signal Line in a 3-wire system.
AR
The Auxiliary Relay (AR) of the iMAC2 Controller. The operation of the AR can be
customised using the application (SLP) software.
B-Line
The Monitoring Line in a 3-wire system or the Signal Line in a 2-wire system.
C-Line
The Common Line for 3-wire and 2-wire systems
Common Line
The Common Line as the name suggests is the common return communications
line of the L1 fieldbus. The Common Line is used in both 2-Wire and 3-Wire
Systems.
CR
The Control Relay (CR) of the iMAC2 Controller. Provides emergency stop function
via End-Of-Line module monitoring.
Fieldbus
The iMAC Fieldbus is the communications backbone for the iMAC system. Can be
run as either a 2-Wire or 3-Wire System.
iMAC
Integrated Monitoring and Control
Monitoring
Line
The Monitoring Line forms part of the L1 fieldbus in a 3-Wire system and is
terminated into a MEOL module
In 3-Wire Systems, all the modules communicate over the Monitoring Line.
This allows communication to continue with all modules if an emergency stop is
activated, which opens the Signal Line. The Signal Line is fed through the
emergency stop contacts.
Multi-drop
The term multi-drop refers to a communications line that allows multiple
communicating devices to be connected to the same line.
Signal Line
The Signal Line forms part of the L1 fieldbus in both 2-Wire and 3-Wire systems.
The Signal Line is feed through the emergency stop contacts and is terminated into
the EOL module. In a 3-Wire System, the Signal Line is used only for tripping and
the modules communicate on the Monitoring Line. In a 2-Wire System, the Signal
Line is used for both tripping and communication.
SLP
Supervisory Logic Program. The Ampcontrol proprietary programming language for
the iMAC2 Controller's application software.
Application (SLP) software must be written, compiled and installed in order for the
iMAC2 Controller to perform intended operation.
