Acromag IP1K100 Series User Manual Download Page 5

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SERIES IP1K100 INDUSTRIAL I/O PACK RECONFIGURABLE DIGITAL I/O MODULE
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Table 2.1: IP1K100 Field I/O Pin Connections (P2)

Pin Description

RS485

TTL

Pin

Number

RS485

TTL

Pin

Number

I/O00+

I/O00

I/O12-

I/O25

I/O00-

I/O01

I/O13+

I/O26

I/O01+

I/O02

I/O13-

I/O27

I/O01-

I/O03

I/O14+

I/O28

I/O02+

I/O04

I/O14-

I/O29

I/O02-

I/O05

I/O15+

I/O30

I/O03+

I/O06

I/O15-

I/O31

I/O03-

I/O07

I/O16+

I/O32

I/O04+

I/O08

I/O16-

I/O33

I/O04-

I/O09

I/O17+

I/O34

I/O05+

I/O10

I/O17-

I/O35

I/O05-

I/O11

I/O18+

I/O36

I/O06+

I/O12

I/O18-

I/O37

I/O06-

I/O13

I/O19+

I/O38

I/O07+

I/O14

I/O19-

I/O39

I/O07-

I/O15

I/O20+

I/O40

I/O08+

I/O16

I/O20-

I/O41

I/O08-

I/O17

I/O21+

I/O42

I/O09+

I/O18

I/O21-

I/O43

I/O09-

I/O19

I/O22+

I/O44

I/O10+

I/O20

I/O22-

I/O45

I/O10-

I/O21

I/O23+

I/O46

I/O11+

I/O22

I/O23-

I/O47

I/O11-

I/O23

I/O12+

I/O24

GND

Table 2.2: IP1K100 Model Channel Assignments

Model

I/O Register Bits

See Table 2.1 for Pin Assignments

IP1K100-0024

Differential/RS485 Channels

0 to

IP1K100-2412

Differential /RS485
Channels

12 to

TTL Channels

0 to 23

IP1K100-4800

TTL Channels 0 to 47

I/O Noise and Grounding Considerations

The IP1K100 is non-isolated between the logic and field I/O

grounds since output common is electrically connected to the IP
module ground. Consequently, the field I/O connections are not
isolated from the carrier board and backplane. Two ounce copper
ground plane foil has been employed in the design of this model to
help minimize the effects of ground bounce, impedance drops, and
switching transients. However, care should be taken in designing
installations without isolation to avoid noise pickup and ground loops
caused by multiple ground connections.

To minimize high levels of EMI the signal ground connection at

the field I/O port (pin 50) should be used to provide a path for
induced common-mode noise and currents. The ground path
provides a low-impedance path to reduce emissions.

EIA RS485/RS422 communication distances are generally

limited to less than 4000 feet. To minimize transmission-line
problems, all nodes connected to the cable must use minimum stub
length connections. The optimal configuration for the RS485/RS422
bus is a daisy-chain connection from node 1 to node 2 to node 3 to

node n. The bus must form a single continuous path, and the nodes
in the middle of the bus must not be at the ends of long branches,
spokes, or stubs. See Drawing 4501-702 for example connection
and termination practices.

Transmission line signal reflections can be minimized with

proper termination. The EIA RS485/RS422 standard allows up to
32 driver/receivers to be connected to a single bus. Termination
resistors should only be used at the two extreme ends of the bus
and not at each of the nodes of the bus. Terminiation resistors are
not provided on the IP1K100. They can be added to the field wiring
as near to the IP module as possible.

IP Logic Interface Connector (P1)

P1 of the IP module provides the logic interface to the mating

connector on the carrier board. This connector is a 50-pin female
receptacle header (AMP 173279-3 or equivalent) which mates to the
male connector of the carrier board (AMP 173280-3 or equivalent).
This provides excellent connection integrity and utilizes gold-plating
in the mating area. Threaded metric M2 screws and spacers are
supplied with the IP module to provide additional stability for harsh
environments (see Drawing 4501-434 for assembly details). Field
and logic side connectors are keyed to avoid incorrect assembly.
The pin assignments of P1 are standard for all IP modules
according to the Industrial I/O Pack Specification (see Table 2.3).
Note that the IP1K100 does not utilize all of the logic signals defined
for the P1 connector and these are indicated in BOLD ITALICS.

Table 2.3: Standard Logic Interface Connections (P1)

Pin Description

Number

Pin Description

Number

GND

CLK

+5V

Reset

∗

R/W

∗