Relays

The IB1005 + SB1005 have six mechanical relays. These relays are rated for 30VDC/16A or 250VAC/15A. If your load is inductive in nature, then the actual power the relays can handle may be several times lower.

Relay Outputs

The relay outputs are on terminal blocks 3 and 4. Both normally closed and normally opened lines are provided for each relay.

For terminal block 3:

Terminal #	Function
9	Relay 3, normally closed line
8	Relay 3, normally opened line
7	Relay 3, common line
6	Relay 2, normally closed line
5	Relay 2, normally opened line
4	Relay 2, common line
3	Relay 1, normally closed line
2	Relay 1, normally opened line
1	Relay 1, common line

For terminal block 4:

Terminal #	Function
9	Relay 6, normally closed line
8	Relay 6, normally opened line
7	Relay 6, common line
6	Relay 5, normally closed line
5	Relay 5, normally opened line
4	Relay 5, common line
3	Relay 4, normally closed line
2	Relay 4, normally opened line
1	Relay 4, common line

Relay control

Six lines of the EM1000 located on the NB10x0 network board control the relays. On power-up, all EM1000 lines are configured as inputs and pulled up internally, keeping relays off. To turn a relay on, set the corresponding control line LOW. Naturally, each relay line must be configured as output.

For all relay control lines:

HIGH (our input^*) — relay off
LOW — relay on

Line	Function	Corresponding EM1000 I/O line	IC1000 cable line
RELAY1 (output)	Relay 1 control	GPIO32	30
RELAY2 (output)	Relay 2 control	GPIO33	28
RELAY3 (output)	Relay 3 control	GPIO34	26
RELAY4 (output)	Relay 4 control	GPIO35	24
RELAY5 (output)	Relay 5 control	GPIO36	22
RELAY6 (output)	Relay 6 control	GPIO37	20

*GPIO line configured as input (default state)