YASKAWA MEMOCON-SC 2000 series reversible counter module

Core positioning

Applicable product: Reversible counter module B2801 (model JAMSC-B2801)

Core application: Pulse counting, signal comparison, data sampling and storage in industrial scenarios, outputting external coincidence signals

Compatible devices: MEMOCON-SC series CPU modules (GL20, GL60S)

Core specification parameters

Specific description of category key parameters

Environmental specifications Operating temperature 0-55 ℃ (Storage temperature -20-85 ℃)

Humidity 10-90% RH (non condensing)

Anti vibration/anti impact in accordance with JIS C0911/C0912 standards

Performance specification count bit GL20: 6 bits (0-999999); GL60S: 8-bit (0-99999999)

Counting speed X1 mode 50kpps, X2 mode 100kpps, X4 mode 200kpps

Two independent counter circuits with two counter channels

Input voltage supports 5V, 12V, 24V pulse input

Output capability: open collector output, maximum load 29V/250mA

Physical dimensions (mm) 38 (width) × 250 (height) × 104 (depth)

Weight approximately 0.6kg

Power consumption 5VDC ± 3%, 0.25A

Four major counter functions

(1) Compare counters

Core function: Pulse counting (supports carry/borrow), outputs coincidence signals by comparing the current value with the preset value

Coincidence mode: 3 types (current value>preset value, current value=preset value, current value<preset value)

Key features: After power on/reset, the current value is reset to zero from the preset value, and the coincidence signal can be reset when the output is disabled

(2) Cyclic counter

Core function: Automatically reset to zero when the current value reaches the preset value or counting width, loop counting

Default parameters: The preset value and counting width are automatically set to 100 after power on

Key feature: When the counting width is set to 0, the counter stays at 0 and does not perform addition or subtraction counting

(3) Sampling counter

Core function: When receiving external sampling signals, latch the current value and store it in the input register

Sampling requirements: Sampling period ≥ 10ms, pulse width ≥ 5ms

Storage allocation: Counter 1 data is stored in input registers 1-2, counter 2 is stored in registers 3-4

(4) Storage counter

Core function: Latch the current value when triggered by external sampling signals, store up to 999 sets of data, and support reading from specified addresses

Key feature: Output coincidence signal when storage reaches preset value, clear storage data when output is disabled

Reading method: Specify the address through pointer commands, and only read stored data when the command is ON

I/O interface configuration

(1) Output coil (CPU → B2801)

Allocation quantity: 24 points (dual counter)/16 points (single counter)

Core signals: module reset, initial settings, count enable, output disable, preset commands, etc

Effective method: Some commands (such as module reset) are OFF → ON and effective, while others (such as count enable) are ON and effective

(2) Input relay (B2801 → CPU)

Allocation quantity: 16 points (dual counter)/8 points (single counter)

Core signals: READY, ACK, carry/borrow, coincidence output, scan time error, etc

Response characteristic: The carry/borrow signal only lasts for one scanning cycle

(3) I/O register

Output registers: 4, 1-2 correspond to counter 1, 3-4 correspond to counter 2, store preset values and initial settings

Input registers: 4, storing monitoring data (current value, sampled value, stored data, etc.), supporting multi-mode monitoring

Installation and wiring specifications

(1) Installation requirements

Environmental restrictions: Prohibit direct sunlight, condensation, corrosive gases, and severe vibration environments

Installation operation: The tightening torque of the module fixing screws meets the standard, and the unused slots need to be covered with dust covers

Switch setting: SW1 is used to switch the number of counting bits (OFF=6 bits, ON=8 bits), SW2 is not used

(2) Wiring requirements

Cable selection: Shielded twisted pair cable is used for signal lines, with a length of ≤ 30m (when 50kpps)

Anti interference measures: The distance from the power line is ≥ 30cm, the shielding layer is grounded at a single point, and a filter is installed on the external power supply

Terminal wiring: Signals such as pulse input, external sampling, and counting enable should be wired according to the terminal definition to avoid misconnection

Test run and troubleshooting

(1) Test running process

Before powering on, check the correctness of switch settings, terminal wiring, and voltage levels

Power on self-test: If the RDY indicator light is on, it indicates that the module is normal (self-test for about 0.8 seconds)

Function verification: Operate the pulse generator and observe the status of PHA/PHB (pulse input) and INC/DEC (counting direction) indicator lights

(2) Common troubleshooting

Common causes and solutions for fault phenomena

Non count count enable not activated, pulse input mode error, wiring error check output coil “count enable” status, pulse mode in initial settings, terminal wiring

Counting numerical error, counting digit setting error, pulse counting mode error, external interference confirmation of SW1 switch position, initial setting parameters, wiring anti-interference measures

Coincidentally, the preset value for abnormal output is set incorrectly, the output is disabled but not turned off. Check the preset value parameters and ensure that the output disabled coil is turned off

RDY light goes out, ROM/RAM error, WDT timeout module reset or power off restart, if ineffective, replace the module

Safety regulations

Operation safety: Wiring and maintenance must be powered off, touching live terminals is prohibited to avoid electric shock

Personnel requirements: Installation and wiring must be carried out by professionals to avoid wiring errors that may cause fires or equipment damage

Prohibition of modification: It is not allowed to disassemble or modify modules. Modified products are not covered by warranty and may pose safety risks