Gai-tronics 12578-002 Monitored Input Module (MIM) Uživatelský manuál stáhnout pdf (Strana 7)

Pub. 42004-711L2B

Model 12578-002 Monitored Input Module (MIM) Page 7 of 12

f:\standard ioms - current release\42004 instr. manuals\42004-711l2b.doc

01/09

Mode 3: IDC Single Normally-Closed (N.C.) Switch

In this configuration, only one normally-closed dry contact closure may be installed per supervised line.

In this mode, the loop is monitored for open circuits, wire-to-wire short circuits (across + and -), and

ground faults. When the contact closure is not active (closed), the 15 kΩ is bypassed and the circuit sees

only the 5.1 kΩ load.

Figure 4. IDC Single Normally-Closed Switch

When the contact closure is active (open), the loop appears as a 20.1 kΩ load (15 kΩ in series with 5.1

kΩ). This changes the value of the input and indicates to the MIM that the contact closure is active. If

there is a short across + and -, if either leg is grounded, or if a break occurs on either leg, the MIM

indicates that a fault has occurred.

OTE: The terminating resistors are not included with the MIM. These resistors are included in a kit

(12509-003) that must be ordered separately.

Mode 4: IAC Line Supervision

(Reserved for 12579-002 Monitored Relay Module)

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Gai-tronics 12578-002 Monitored Input Module (MIM) Uživatelský manuál Strana 7