Rice Lake Intrinsically Safe - Manual (Page 68)

62 320IS Installation Manual
8.6 Digital Inputs
The
320IS
has four digital inputs that can be used to control pre-defined operations in the indicator. Table 8-9
outlines the various functions for the digital inputs.
Digital inputs are available on connector CN4 (see Figure 8-1 on page 58). All inputs are individually isolated via
optocouplers. Table 8-9 outlines the pin connections for CN4.
The digital inputs are designed to receive 0-24V/TTL signals on the incoming lines. Care should be taken to apply
the right DC polarity. Pins 9 and 10 (+5V and DGND) can be used to supply power to the digital inputs. Maximum
current draw should not exceed 0.25A.
See the applicable indicator installation manual for information on checking current digital input states.
8.7 Relay Contact Outputs
The
320IS
features four relay contact outputs, which default to open. This allows switching of maximum +30VDC,
5A or 250VAC, 5A for each of the four digital channels.
The relay contact outputs are controlled by user-configurable setpoints. The setpoint values and operating
parameters can be defined in the SETPNT menu of the host indicator. See the indicator installation manual for
information on configuring setpoints.
Table 8-10 show pin connections for CN5 of the
320IS
board.
The states of the relay contacts are indicated by LEDs LD1–LD4 (see Figure 8-1 on page 58). When an LED is lit,
the contacts of the corresponding relay are closed. See the applicable indicator installation manual for information
on checking relay contact functionality.
Pin State Description
1 Hi Digital Input 1 (+V)
2 Low Ground 1 (–V)
3 Hi Digital Input 2 (+V)
4 Low Ground 2 (–V)
5 Hi Digital Input 3 (+V)
6 Low Ground 3 (–V)
7 Hi Digital Input 4 (+V)
8 Low Ground 4 (–V)
9 Hi +5V
10 Low DGND
Table 8-9. CN4 Connections
Pin Description
1 Output 1_A
2 Output 1_B
3 Output 2_A
4 Output 2_B
5 Output 3_A
6 Output 3_B
7 Output 4_A
8 Output 4_B
Table 8-10. CN5 Connections