HIMA F6705 Analog Output Module
Product Description
The HIMA F6705 is a dual‑channel safety‑related digital‑to‑analog conversion output module designed for HIMA safety programmable electronic systems. It supports 0/4‑20 mA current signal output. Each channel features independent electrical isolation and safety isolation with integrated safe shutdown function. It supports both source and sink wiring modes and meets safety requirement levels AK1‑AK6.
The HIMA F6705 performs automatic full‑detection tests during operation to guarantee functional safety of analog output loops. Redundant current wiring and bipolar current wiring configurations are supported, making it suitable for analog control output scenarios in safety instrumented systems.
Technical Specifications
| Number of channels | 2 channels |
| Output signal | 0/4‑20 mA |
| Resolution | 12 bit, 4095 steps, 0 corresponds to 0 mA, 3840 corresponds to 20 mA |
| Source‑mode load resistance RB | ≤550 Ω, including line resistance |
| Sink‑mode load resistance RB | ≤(UQ‑10V)/21.2 mA, UQ stands for external supply voltage |
| Basic error | ≤0.2% (40 μA) @25 °C |
| Operating error | ≤0.4%, temperature range 0~+60 °C |
| Maximum cable length | 1000 m, load resistance calculation required |
| Dielectric withstand voltage | 250 V, relative to analog ground |
| External supply UQ for sink mode | 10‑30 VDC |
| Space requirement | 4TE |
| Power consumption | 5V DC 85 mA, 24V DC 130 mA |
| Automatic test items | DA converter linearity, inter‑channel crosstalk, safe shutdown loop |
| Safety level | AK1~AK6 |
| Certifications | TUV, CE |
Core Advantages
- The HIMA F6705 provides independent galvanic isolation between channels. A single‑channel fault will not interfere with output of the other channel.
- Continuous background automatic diagnosis is implemented without manual periodic testing. Safe shutdown will be triggered to switch to safe state upon fault detection.
- Hardware supports redundant parallel output and bipolar ‑20 mA~+20 mA output configuration. Both wiring modes are hardware‑compatible for flexible engineering configuration.
- Wide operating temperature range and long‑distance wiring capability fit industrial field conditions. Ideal for driving analog valves and actuators within safety control systems.
Product Features
- Dual‑channel independently isolated analog output with integrated safe shutdown loop.
- Full automatic runtime detection of DA linearity, channel crosstalk and safe‑shutdown functions.
- Hardware supports both source and sink wiring modes.
- Redundant parallel current wiring and bipolar positive‑negative current output wiring are supported.
- Unused channels must be short‑circuited via jumpers to avoid module fault alarms.
- Field wiring completed with dedicated cable plug Z7126/6705.
- Compact 4TE rack‑mount dimension for HIMA rack slots.
- TUV and CE safety certifications, compliant with AK1‑AK6 safety‑level requirements.
Application Fields
Petrochemical SIS safety instrumented systems, oil‑gas long‑distance pipeline safety control systems, power‑plant boiler safety protection, metallurgical plant safety interlocks, pharmaceutical process safety control, offshore‑platform safety automation, machinery functional‑safety systems. The HIMA F6705 mainly outputs safety analog control current signals to field valve positioners, regulating valves and actuators.
Comparison with HIMA Peer Products
| Model | Channels | Type | Key Differences |
| F6705 | 2‑channel | Analog output | Supports source/sink, redundant wiring, bipolar wiring, AK1‑AK6 |
| F6706 | 2‑channel | Analog output | Peer analog‑output module with partial hardware parameter differences, compatible with Z7126 plug |
| F6217 | 8‑channel | Analog input | Analog acquisition card for receiving transmitter signals, no output capability |
| F3331 | 4‑channel | Analog output | I/O for compact HIMatrix controllers; F6705‑style bipolar wiring not supported |
Matching Accessories
- Cable plug: Z7126/6705. The F6705 requires this flat‑pin plug assembly for field‑side wiring.
- Recommended cable: LiYCY 8×0.5 mm²
- Controller: HIMA HIQuad series controllers
- Rack: Compatible with HIQuad system rack slots
- Note: Jumpers shall short‑circuit unused channels. Channel 1: short b6‑b8; Channel 2: short b22‑b24 to prevent channel‑fault alarms on F6705.
Recommended HIMA Models
F6706, F6215, F6217, F3322, F3330, F3331, F3422, F3224A, F7126, F8620, F8621/A, F60 CPU 03
Precautions
- All unused channels of HIMA F6705 must be short‑circuited by jumpers on terminals; otherwise module fault alarms will occur.
- For redundant parallel‑wiring scenarios, permissible load resistance is halved. Both parallel channels shall be configured in identical source or sink mode.
- For bipolar‑current wiring, only one module may source or sink current at a time. User‑program logic constraints are required to guarantee output accuracy.
- The theoretical maximum cable length is 1000 m. Total load resistance including line resistance shall be calculated and must not exceed module limits.
- In sink mode, external supply UQ shall stay within 10‑30 VDC. Output abnormalities will arise outside this voltage range.
- Shield layers shall connect to rack ground bar via 6.3×0.8 flat pins of the plug. Shield connections shall not be left floating.
- This is a precision safety I/O card. ESD electrostatic protection shall be implemented during installation and maintenance.
FAQ
Q：What are potential causes for frequent channel‑fault alarms on HIMA F6705?
A： First verify jumpers are fitted for unused channels. Check whether field‑side load resistance exceeds rated limits. Confirm proper crimping of series‑b terminal pins and inspect cable‑shield grounding conditions.
Q：How to distinguish source mode from sink mode for HIMA F6705?
A： In source mode, the module outputs current outward. In sink mode, the module absorbs current; sink mode requires external UQ supply of 10‑30 V DC. Terminal pin assignments differ for the two modes; refer to hardware block diagrams for wiring.
Q：How to calculate load‑resistance parameters for redundant parallel output with F6705?
A： Under parallel‑redundant configuration, permissible load resistance drops to half of single‑channel rating. Both channels must use identical source or sink mode. Program logic shall distribute output current evenly between channels.
Q：Does F6705 support ‑20 mA to +20 mA bipolar output?
A： Bipolar wiring is hardware‑supported, yet two F6705 modules are required. User‑program logic shall ensure only one module sources/sinks current at any moment to preserve output accuracy.
Q：Is Z7126 plug supplied together with HIMA F6705 upon purchase?
A： F6705 main unit and Z7126 cable plug are separate items. They need to be ordered separately; the plug assembly is not included by default.
Q：What maximum field‑cable length is allowed for F6705?
A： Theoretical maximum length is 1000 m. Cable itself introduces line resistance, which must be summed into RB load‑resistance calculation and shall not exceed module limits.
Q：Can HIMA F6705 directly drive ordinary DCS regulating valves?
A： It can drive valve positioners with 4‑20 mA input. Always verify total load resistance on valve side stays within module‑specification limits.
Q：Will F6705 automatic tests disturb normal field output?
A： Runtime automatic tests are internal background diagnostics and will not interrupt regular analog output. Safe‑shutdown action is triggered only if faults are detected.
Product Tags
HIMA F6705, 2‑fold analog output module, HIMA analog output module, HIMA safety I/O card, HIQuad system I/O module, SIL safety analog output card, AK1‑AK6 digital‑to‑analog module, 0‑20 mA safety output module
