Two fiber optic cables are required for bidirectional communication to each port on the ACM500
(COM4 and COM5). If both ports are required, then a total of four cables will be required.
The fiber optic cable connectors and the sockets on the interface board are color-coded. Each cable
has one blue and one gray end, which should be connected to the same color on the interface
board, as shown in Figure 3-8.
The following instructions assume that the fiber optic cables are already connected to the fiber optic
interface board in the IND560x and the other ends of the cables are available at the ACM500.
Depending upon the country of installation, special protection such as conduit seals may be
required. Refer to the control drawing, the approval certificates and local regulations to determine
what is required.
1. Make certain that power is removed from the ACM500 communication module and the
2. Feed the ends of the fiber optic cables through the split bushing of the correct cable gland
3. When connecting fiber optic cables to COM4, determine which two fiber optic cables come from
3-8
METTLER TOLEDO ACM500 Installation Manual
Figure 3-8: Color-Coded Fiber Optic Cable Connections
IND560x terminal.
(identified in (Figure 3-5) until the cable reaches the fiber optic interface board (approximately
90 mm/3.5 in.). The COM4 cables should enter through the upper cable gland "A", the COM5
cables through cable gland "B" just below.
Be sure the fiber optic cable is not bent to less than a 13 mm (1/2 inch) radius. Any sharp
kinks in the fiber optic cable will damage it, requiring that the cable be replaced. Coil any
excess cable neatly in large loops close to the ACM500 and secure it so it does not get
damaged.
the COM4 port of the IND560x. Plug the fiber optic cable from the IND560x COM4 transmitter
(U1) into the ACM500 COM4 receiver (U3) and the cable from the IND560x COM4 receiver
(U3) into the ACM500 COM4 transmitter (U1). Refer to Figure 3-9 to help identify the
transmitters and receivers on the ACM500 fiber optic interface board. Figure 3-10 shows
correct wiring between the IND560x and the ACM500.
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