General
Number of inputs	16
Insulation	3 kVDC
Input voltage	24 VDC
Input types	Dry contact, wet contact (NPN/PNP)
I/O modes	Digital Input, Event counter, Frequency input
Counter frequency	5 kHz
Channels per COM	8
Pulse frequency (PO)	5 kHz
Connection type	Spring clamps (Euroblock)
Wiring	I/O cable, 14 to 28 AWG
Electricity consumption	50,0 mA
Operation temperature	-40 to 75 °C
Storage temperature	-40 to 85 °C
Air humidity	5–95 % (non-condensing)
Elevation	up to 2000 m
EMC certification	EN 55032/24, EN 61000-6-2/-6-4
EMI certification	CISPR 32, FCC Part 15B Class A
EMS certification	ESD: 6 kV contact, 8 kV air; RS: 5100–6000 MHz, 3 V/m; EFT: 1 kV (power), 0.5 kV (signal); Surge: 2 kV (power), 1 kV (signal); CS: 10 V
Railway certification	EN 50121-4, EN 50155 (partially compliant)
Safety certification	UL 508
Shock certification	IEC 60068-2-27
Vibration certification	IEC 60068-2-6
MTBF	1.132.561 Hours (Telcordia SR332)

The 85M-1602-T module of the ioPAC 8500/8600 series by Moxa is a digital input module with 16 channels, developed for use in industrial environments under extreme conditions. It is designed for capturing digital signals from sensors, switches, or other peripheral devices and enables flexible integration into automation systems. The module supports both sourcing- and sinking-configuration and operates with a nominal input voltage of 24 VDC. The integrated isolation of 3 kVDC protects connected control systems from voltage surges and electrical disturbances, which is particularly important in industrial facilities with high electromagnetic interference.

Applications
This module is suitable for applications requiring status monitoring, counting operations, or event detection. Typical use cases include monitoring machine status, counting products on conveyor belts, recording operating hours, or logging switching operations. The support for dry and wet contacts (NPN/PNP) expands its application possibilities, as it is compatible with both passive switches and active sensors.

Functions and Features in Detail
The module offers three different I/O modes: Digital Input (DI), event counter, and frequency input. In counter mode, it can detect frequencies up to 5 kHz, making it suitable for fast counting operations. The channels are grouped in sets of 8 channels per COM port, which optimizes communication and data processing. The input voltage is 24 VDC, with an ON state defined by a short to GND for dry contacts and a voltage of 10 to 30 VDC for wet contacts. An OFF state is defined by an open contact for dry contacts and 0 to 3 VDC for wet contacts.

Technology Explained Simply
The spring-cage terminals (Euroblock) allow for quick and secure wiring with I/O cables in cross-sections from 14 to 28 AWG. The compact design with dimensions of 25 x 128.2 x 85.5 mm and a weight under 80 g makes the module ideal for space-saving installations in enclosures. The low power consumption of 50.0 mA at 24 VDC reduces the load on power supply systems. The operating temperature range of -40 to 75 °C enables use in demanding climatic environments, such as outdoor installations, cooling plants, or hot production halls. The storage temperature range of -40 to 85 °C and humidity of 5–95 % (non-condensing) highlight the module’s robustness.

Compatibility and Accessories
The module is part of the ioPAC 8500/8600 series and can be combined with other modules in the series to create modular automation solutions. It is designed for use in industrial control systems equipped with appropriate interfaces. Certifications according to EN 55032/24, EN 61000-6-2/-6-4, CISPR 32, FCC Part 15B Class A, and UL 508 ensure compliance with electromagnetic compatibility and safety standards. The EMS certifications include ESD (6 kV contact, 8 kV air), RS (5100–6000 MHz, 3 V/m), EFT (1 kV power, 0.5 kV signal), Surge (2 kV power, 1 kV signal), and CS (10 V), ensuring high immunity under real operating conditions. Additionally, the module is partially compliant with railway standards EN 50121-4 and EN 50155, enabling use in rail vehicle applications.

Mounting and Installation
Mounting is done via spring-cage terminals, which allow for quick and reliable connections to attached sensors or switches. Wiring is performed using I/O cables within the specified cross-section. Installation takes place in enclosures or other protected environments, with an altitude limit of 2000 m above sea level. For higher altitudes, individual inquiries to Moxa are required.

Operational Advantages
The high MTBF of 1,132,561 hours (Telcordia SR332) demonstrates the module’s high reliability. The 5-year warranty underscores its quality and durability. The combination of compact design, high immunity, flexible input modes, and wide temperature tolerance makes the module a robust solution for demanding industrial applications.

Certifications and Standards
The module meets the requirements of standards EN 55032/24, EN 61000-6-2/-6-4, CISPR 32, FCC Part 15B Class A, UL 508, IEC 60068-2-27 (shock), and IEC 60068-2-6 (vibration). Partial compliance with EN 50121-4 and EN 50155 enables use in railway applications. The certifications guarantee electromagnetic compatibility, safety, and mechanical robustness.