AccuLoad IV Installation & Maintenance Manual
Installation 30
Up to two A4I modules can be connected to an A4M board and can either be mounted inside the AccuLoad
enclosure or in a separate external enclosure.
The replaceable parts on the A4I board are the power fuse and the AC digital output relays.
3.5.6.1 A4I I/O Connections
The A4I board requires 24 VDC power and either serial or Ethernet communications connections to the
A4M board to operate. Ethernet communications should be used whenever possible, but the serial
communication option is provided to facilitate upgrades and maintain backward compatibility.
For any additive meters connected to pulse inputs located on the A4I, the digital outputs controlling the
associated pump and solenoid valve must be located on the same A4I module.
Figure 17: A4I Board Layout
U22
TB5
TB4
U4
S1
P1
U5
P8
S2
U27
SSR8
SSR18
SSR19
SSR20
SSR17
SSR16
SSR15
SSR14
SSR13
SSR12
SSR11
SSR10
SSR9
SSR7
SSR6
SSR5
SSR4
SSR3
SSR2
SSR1
TB3
TB2
TB1
C5
C14
F1
D3
TB7
TB6
TB8TB9
CN1
LMOD1
CN2
U9
U11
U10
CN3
ETH2
ETH1
Ethernet Connections
DIP
Switches
Power
Fuse
AC Digital
Output Relays
24V
12V
5V
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