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- NI 9421
- Getting Started Manual
National Instruments NI 9421 Getting Started Manual
Summary of NI 9421
Page 1
Getting started guide ni 9421 8-channel sinking digital input module.
Page 2: Note
This document explains how to connect to the ni 9421. In this document, the ni 9421 with screw terminal, ni 9421 with spring terminal, and ni 9421 with dsub are referred to inclusively as the ni 9421. Note before you begin, complete the software and hardware installation procedures in your chassis d...
Page 3: Caution
Way. If the product is damaged, return it to ni for repair. Safety guidelines for hazardous voltages if hazardous voltages are connected to the device, take the following precautions. A hazardous voltage is a voltage greater than 42.4 vpk voltage or 60 vdc to earth ground. You can connect hazardous ...
Page 4
Properly insulated from human contact. You must use the ni 9932 connector backshell kit to ensure that the terminals are not accessible. Ni 9421 with screw/spring terminal safety voltages connect only voltages that are within the following limits: .......................................................
Page 5: Caution
Caution do not connect the ni 9421 with screw terminal or ni 9421 with spring terminal to signals or use for measurements within measurement categories iii or iv. Ni 9421 with dsub safety voltages connect only voltages that are within the following limits: ..............................................
Page 6: Caution
Equipment, limited-energy parts of equipment, circuits powered by regulated low-voltage sources, and electronics. Caution do not connect the ni 9421 with dsub to signals or use for measurements within measurement categories ii, iii, or iv. Note measurement categories cat i and cat o are equivalent. ...
Page 7: Caution
Caution do not remove modules unless power has been switched off or the area is known to be nonhazardous. Caution substitution of components may impair suitability for class i, division 2. Caution for division 2 and zone 2 applications, install the system in an enclosure rated to at least ip54 as de...
Page 8: Caution
An ni chassis that has been evaluated as ex nc iic t4, ex iic t4, ex na iic t4, or ex nl iic t4 equipment. Caution you must make sure that transient disturbances do not exceed 140% of the rated voltage. Caution the system shall only be used in an area of not more than pollution degree 2, as defined ...
Page 9
When the product is operated in the intended operational electromagnetic environment. This product is intended for use in industrial locations. However, harmful interference may occur in some installations, when the product is connected to a peripheral device or test object, or if the product is use...
Page 10: Caution
Caution in order to meet the emc requirements for marine applications, install the product in a shielded enclosure with shielded and/or filtered power and input/output ports. In addition, take precautions when designing, selecting, and installing measurement probes and cables to ensure that the desi...
Page 12: Figure 1. Ni 9421 Pinout
Figure 1. Ni 9421 pinout di0 di1 di2 di3 di4 di5 di6 di7 nc com di0 di1 di2 di3 di4 di5 di6 di7 nc com 0 4 3 2 1 5 6 9 8 7 3 7 0 1 2 3 4 5 6 7 8 9 0 4 com nc com com nc com com nc com com nc com com di0 nc di1 di2 nc di3 di4 nc di5 di6 nc di7 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 ...
Page 13
Ni 9421 signals each channel of the ni 9421 has a di terminal or pin to which you can connect voltage or current signals. The ni 9421 also has com, a common terminal or pin that is internally connected to the isolated ground reference of the module. The ni 9421 has sinking inputs, meaning that when ...
Page 14
Figure 2. Connecting a device to the ni 9421 (3-wire device shown) ni 9421 + – sourcing-output device com di external power supply the ni 9421 channel registers as on when the sourcing-output device applies a voltage or drives a current that is in the input on range to di. The channel registers as o...
Page 15: Table 1. Led Indications
Table 1. Led indications led state indication illuminated channel is on not illuminated channel is off high-vibration application connections if your application is subject to high vibration, ni recommends that you follow these guidelines to protect connections to the ni 9421: • use ferrules to term...
Page 17
Worldwide support and services the national instruments website is your complete resource for technical support. At ni.Com/support , you have access to everything from troubleshooting and application development self-help resources to email and phone assistance from ni application engineers. Visit n...
Page 18
National instruments corporate headquarters is located at 11500 north mopac expressway, austin, texas, 78759-3504. National instruments also has offices located around the world. For telephone support in the united states, create your service request at ni.Com/support or dial 1 866 ask myni (275 696...