加减计数的本质与加计数相同，计数输入信号每出现一次上升沿，计数器从0开始加"1"，当计数达到设定值(PV)时，计数器的输出触点接通。计数达到设定值后如果继续输入计数信号，计数值仍然增加，输出触点保持接通状态。当现行值加到较大值32767后，如果再输入加计数信号，现行值变为-32768，再继续进行加计数。
同时，减计数输入信号也起作用，减计数输入每出现一次上升沿，计数器从现行值开始减"1"。当现行值减到较小值-32768后，如果再输入减计数信号，现行值变为 32767，再继续进行减计数。
计数器具有信号(R)输入，当信号为"1"时，现行计数值被清"0"，设定值写入，输出触点强制断开。
(2) S7-200 PLC的计数器编程。S7-200 PLC的计数器梯形图与指令表编程方法如图3-49所示，图中的PV为计数设定值输入端，R为复位输入端。
倍德立（厦门）科技有限公司
销售经理:张卫东 联系电话：13055237500 座机：0592-6085900 QQ:3454941352
销售经理：杨帆 联系电话：13358371730 座机：0592-6085900 QQ: 2921696645
销售经理：叶工 联系电话：15359890861 座机：0592-6087118 QQ: 2650907184
优势品牌：
Siemens（西门子）:
● 西门子S7-200CN、S7-200SMART、ET200、 S7-300 、S7-400 、6AV、6G系列备件.
● HMI 触摸屏TD200、TD400C、TP177、MP277、MP377、SMART700 、SMART1000.
● MM系列变频器、电源模块、1200模块、触摸屏、1500模块、smart模块.
● 西门子电线电缆、DP接头 、网线网卡等附件.
AB（罗克韦尔）:1734/1746/ 1747/ 1756/1762系列， 承接AB罗克韦尔全系列PLC 变频器、触摸屏、软启动、伺服等业务.
Schneider（施耐德）:PLC控制器、140处理器、输入输出模块、电源模块、变频器低压配件等。
P+F倍加福、Phoenix菲尼克斯、IFM易福门、Beckhoff倍福、富士、ABB低压 等进口品牌.
EE-SX671A
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P0914TN
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FBM215
TRICONEX
1756-IF16H
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221-1BH22-0XA8
RM9001
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ACS550-01-180A-4
SMIO-01
ACS550-01-045A-4
ACS550-01-290A-4
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20-HIM-A6
SA 4100
G E 40258
G 1/2 E 43375
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1LE1001-1DB43-4JA4-Z
C98043-A7006
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E3ZG-D61-S 2M BY OMS
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CJ1W-AD081-V1
CP1W-CIF01
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CP2E-N60DT-D
CP2E-N40DT-D
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CP1H-X40DT-D
NB10W-TW01B
D4NS-1AF
E39-R1
E3Z-D61
E3Z-G61
E3Z-R61
E3Z-T61
E3Z-R81
E6B2-CWZ6C 360P/R 2M
E6B2-CWZ6C 600P/R 2M
E6B2-CWZ6C 1000P/R 2M
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E5CC-RX2ASM-800
E5CC-QX2ASM-800
E5CC-RX2ASM-802
E5CC-QX2ASM-802
EE-1006 2M
EE-SX671
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IM1-22Ex-R 7541231
IM33-22Ex-Hi/24VDC 7506441
IM1-22Ex-T 7541232
山特C1K
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NSC100S3100N
FR-E840-0026-4-60
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VADMI-300-P
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VADMI-300
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ITV1010-012N
ITV2090-312N5
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